[FL-2627] Flipper applications: SDK, build and debug system (#1387)

* Added support for running applications from SD card (FAPs - Flipper Application Packages)
* Added plugin_dist target for fbt to build FAPs
* All apps of type FlipperAppType.EXTERNAL and FlipperAppType.PLUGIN are built as FAPs by default
* Updated VSCode configuration for new fbt features - re-deploy stock configuration to use them
* Added debugging support for FAPs with fbt debug & VSCode
* Added public firmware API with automated versioning

Co-authored-by: hedger <hedger@users.noreply.github.com>
Co-authored-by: SG <who.just.the.doctor@gmail.com>
Co-authored-by: あく <alleteam@gmail.com>

applications/services/dialogs/view_holder.h

@@ -0,0 +1,98 @@
+#pragma once
+
+#include <gui/view.h>
+#include <gui/gui.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct ViewHolder ViewHolder;
+
+/** 
+ * @brief Free callback type
+ */
+typedef void (*FreeCallback)(void* free_context);
+
+/** 
+ * @brief Back callback type
+ * @warning comes from GUI thread
+ */
+typedef void (*BackCallback)(void* back_context);
+
+/**
+ * @brief Allocate ViewHolder
+ * @return pointer to ViewHolder instance
+ */
+ViewHolder* view_holder_alloc();
+
+/**
+ * @brief Free ViewHolder and call Free callback
+ * @param view_holder pointer to ViewHolder
+ */
+void view_holder_free(ViewHolder* view_holder);
+
+/**
+ * @brief Set view for ViewHolder
+ * 
+ * @param view_holder ViewHolder instance
+ * @param view View instance
+ */
+void view_holder_set_view(ViewHolder* view_holder, View* view);
+
+/**
+ * @brief Set Free callback
+ * 
+ * @param view_holder ViewHolder instance
+ * @param free_callback callback pointer
+ * @param free_context callback context
+ */
+void view_holder_set_free_callback(
+    ViewHolder* view_holder,
+    FreeCallback free_callback,
+    void* free_context);
+
+/**
+ * @brief Free callback context getter. Useful if your Free callback is a module destructor, so you can get an instance of the module using this method.
+ * 
+ * @param view_holder ViewHolder instance
+ * @return void* free callback context
+ */
+void* view_holder_get_free_context(ViewHolder* view_holder);
+
+void view_holder_set_back_callback(
+    ViewHolder* view_holder,
+    BackCallback back_callback,
+    void* back_context);
+
+/**
+ * @brief Attach ViewHolder to GUI
+ * 
+ * @param view_holder ViewHolder instance
+ * @param gui GUI instance to attach to
+ */
+void view_holder_attach_to_gui(ViewHolder* view_holder, Gui* gui);
+
+/**
+ * @brief Enable view processing
+ * 
+ * @param view_holder 
+ */
+void view_holder_start(ViewHolder* view_holder);
+
+/**
+ * @brief Disable view processing
+ * 
+ * @param view_holder 
+ */
+void view_holder_stop(ViewHolder* view_holder);
+
+/** View Update Handler
+ * @param view, View Instance
+ * @param context, ViewHolder instance
+ */
+void view_holder_update(View* view, void* context);
+
+#ifdef __cplusplus
+}
+#endif