[FL-1217] Menu refactoring (#726)

* menu: remove dead code
* loader: change views from modules instead of menu service
* dolphin: start main menu with loader API
* applications: don't start menu service
* loader: add debug tools menu
* gui modules: introduce menu model
* loader: remove calls to menu service API
* gui modules: implement menu module
* loader: add menu view
* gui menu: add animation
* applications: remove menu service
* gui modules: rename icon_menu -> menu
* loader: clean up code
* menu module: add documentation, format code
* menu: remove unused parameter
* desktop: use loader to launch primary menu
* Applications: cleaner makefile app declaration. Loader: application autostart
* Gui: cleanup menu and submenu API.

Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

lib/app-scened-template/view-modules/submenu-vm.cpp

@@ -16,12 +16,12 @@ void SubmenuVM::clean() {
     submenu_clean(submenu);
 }
 
-SubmenuItem* SubmenuVM::add_item(
+void SubmenuVM::add_item(
     const char* label,
     uint32_t index,
     SubmenuItemCallback callback,
     void* callback_context) {
-    return submenu_add_item(submenu, label, index, callback, callback_context);
+    submenu_add_item(submenu, label, index, callback, callback_context);
 }
 
 void SubmenuVM::set_selected_item(uint32_t index) {

lib/app-scened-template/view-modules/submenu-vm.h

@@ -16,9 +16,8 @@ public:
      * @param index - menu item index, used for callback, may be the same with other items
      * @param callback - menu item callback
      * @param callback_context - menu item callback context
-     * @return SubmenuItem instance that can be used to modify or delete that item
      */
-    SubmenuItem* add_item(
+    void add_item(
         const char* label,
         uint32_t index,
         SubmenuItemCallback callback,