[FL-1906] Documentation: add Doxyfile, prepare sources for doxygen. (#741)

* Documentation: add Doxyfile, prepare sources for doxygen.

* Update ReadMe and remove obsolete CLA

* Add contribution guide

* Contributing: update text

* Correct spelling

applications/gui/view.h

@@ -1,3 +1,8 @@
+/**
+ * @file view.h
+ * GUI: View API
+ */
+
 #pragma once
 
 #include <input/input.h>
@@ -27,57 +32,57 @@ typedef enum {
 typedef struct View View;
 
 /** View Draw callback
- * @param canvas, pointer to canvas
- * @param view_model, pointer to context
- * @warning called from GUI thread
+ * @param      canvas,      pointer to canvas
+ * @param      view_model,  pointer to context
+ * @warning    called from GUI thread
  */
 typedef void (*ViewDrawCallback)(Canvas* canvas, void* model);
 
 /** View Input callback
- * @param event, pointer to input event data
- * @param context, pointer to context
- * @return true if event handled, false if event ignored
- * @warning called from GUI thread
+ * @param      event,    pointer to input event data
+ * @param      context,  pointer to context
+ * @return     true if event handled, false if event ignored
+ * @warning    called from GUI thread
  */
 typedef bool (*ViewInputCallback)(InputEvent* event, void* context);
 
 /** View Custom callback
- * @param event, number of custom event
- * @param context, pointer to context
- * @return true if event handled, false if event ignored
+ * @param      event,    number of custom event
+ * @param      context,  pointer to context
+ * @return     true if event handled, false if event ignored
  */
 typedef bool (*ViewCustomCallback)(uint32_t event, void* context);
 
 /** View navigation callback
- * @param context, pointer to context
- * @return next view id
- * @warning called from GUI thread
+ * @param      context,  pointer to context
+ * @return     next view id
+ * @warning    called from GUI thread
  */
 typedef uint32_t (*ViewNavigationCallback)(void* context);
 
 /** View callback
- * @param context, pointer to context
- * @warning called from GUI thread
+ * @param      context,  pointer to context
+ * @warning    called from GUI thread
  */
 typedef void (*ViewCallback)(void* context);
 
-/** View Update Callback
- * Called upon model change, need to be propagated to GUI throw ViewPort update
- * @param view, pointer to view
- * @param context, pointer to context
- * @warning called from GUI thread
+/** View Update Callback Called upon model change, need to be propagated to GUI
+ * throw ViewPort update
+ * @param      view,     pointer to view
+ * @param      context,  pointer to context
+ * @warning    called from GUI thread
  */
 typedef void (*ViewUpdateCallback)(View* view, void* context);
 
 /** View model types */
 typedef enum {
-    /* Model is not allocated */
+    /** Model is not allocated */
     ViewModelTypeNone,
-    /* Model consist of atomic types and/or partial update is not critical for rendering.
+    /** Model consist of atomic types and/or partial update is not critical for rendering.
      * Lock free.
      */
     ViewModelTypeLockFree,
-    /* Model access is guarded with mutex.
+    /** Model access is guarded with mutex.
      * Locking gui thread.
      */
     ViewModelTypeLocking,
@@ -89,98 +94,115 @@ typedef enum {
 View* view_alloc();
 
 /** Free View
- * @param View instance
+ *
+ * @param      view  instance
  */
 void view_free(View* view);
 
 /** Tie IconAnimation with View
- * @param view, View instance
- * @param icon_animation, IconAnimation instance
+ *
+ * @param      view            View instance
+ * @param      icon_animation  IconAnimation instance
  */
 void view_tie_icon_animation(View* view, IconAnimation* icon_animation);
 
 /** Set View Draw callback
- * @param view, View instance
- * @param callback, draw callback
+ *
+ * @param      view      View instance
+ * @param      callback  draw callback
  */
 void view_set_draw_callback(View* view, ViewDrawCallback callback);
 
 /** Set View Input callback
- * @param view, View instance
- * @param callback, input callback
+ *
+ * @param      view      View instance
+ * @param      callback  input callback
  */
 void view_set_input_callback(View* view, ViewInputCallback callback);
 
 /** Set View Custom callback
- * @param view, View instance
- * @param callback, input callback
+ *
+ * @param      view      View instance
+ * @param      callback  input callback
  */
 void view_set_custom_callback(View* view, ViewCustomCallback callback);
 
 /** Set Navigation Previous callback
- * @param view, View instance
- * @param callback, input callback
+ *
+ * @param      view      View instance
+ * @param      callback  input callback
  */
 void view_set_previous_callback(View* view, ViewNavigationCallback callback);
 
 /** Set Enter callback
- * @param view, View instance
- * @param callback, callback
+ *
+ * @param      view      View instance
+ * @param      callback  callback
  */
 void view_set_enter_callback(View* view, ViewCallback callback);
 
 /** Set Exit callback
- * @param view, View instance
- * @param callback, callback
+ *
+ * @param      view      View instance
+ * @param      callback  callback
  */
 void view_set_exit_callback(View* view, ViewCallback callback);
 
 /** Set Update callback
- * @param view, View instance
- * @param callback, callback
+ *
+ * @param      view      View instance
+ * @param      callback  callback
  */
 void view_set_update_callback(View* view, ViewUpdateCallback callback);
 
 /** Set View Draw callback
- * @param view, View instance
- * @param context, context for callbacks
+ *
+ * @param      view     View instance
+ * @param      context  context for callbacks
  */
 void view_set_update_callback_context(View* view, void* context);
 
 /** Set View Draw callback
- * @param view, View instance
- * @param context, context for callbacks
+ *
+ * @param      view     View instance
+ * @param      context  context for callbacks
  */
 void view_set_context(View* view, void* context);
 
 /** Set View Orientation
- * @param view, View instance
- * @param orientation, either vertical or horizontal
+ *
+ * @param      view         View instance
+ * @param      orientation  either vertical or horizontal
  */
 void view_set_orientation(View* view, ViewOrientation orientation);
 
 /** Allocate view model.
- * @param view, View instance
- * @param type, View Model Type
- * @param size, size
+ *
+ * @param      view  View instance
+ * @param      type  View Model Type
+ * @param      size  size
  */
 void view_allocate_model(View* view, ViewModelType type, size_t size);
 
 /** Free view model data memory.
- * @param view, View instance
+ *
+ * @param      view  View instance
  */
 void view_free_model(View* view);
 
 /** Get view model data
- * @param view, View instance
- * @return pointer to model data
- * @warning Don't forget to commit model changes
+ *
+ * @param      view  View instance
+ *
+ * @return     pointer to model data
+ * @warning    Don't forget to commit model changes
  */
 void* view_get_model(View* view);
 
 /** Commit view model
- * @param view, View instance
- * @param update, true if you want to emit view update, false otherwise
+ *
+ * @param      view    View instance
+ * @param      update  true if you want to emit view update, false otherwise
  */
 void view_commit_model(View* view, bool update);
 
@@ -196,11 +218,13 @@ void view_commit_model(View* view, bool update);
         view_commit_model(view, update);                    \
     }
 #else
-/** 
- * With clause for view model
- * @param view, View instance pointer
- * @param function_body a (){} lambda declaration, executed within you parent function context
- * @return true if you want to emit view update, false otherwise
+/** With clause for view model
+ *
+ * @param      view           View instance pointer
+ * @param      function_body  a (){} lambda declaration, executed within you
+ *                            parent function context
+ *
+ * @return     true if you want to emit view update, false otherwise
  */
 #define with_view_model(view, function_body)                      \
     {                                                             \