C++ apps: templated scene controller (#517)

* C++ apps: templated scene controller
* templated app: fix type names
* templated app: text store component
* Applications: add "Templated Scene" application
* templated app: refractoring
* Gui module byte input: fix docs
* templated app: new byte input scene
* templated app: dialog ex view module
* templated app: popup view module
* templated app: dialog-ex view module, fix docs
* templated app: text input view module
* Gui module text input: fix docs
* Furi: duplicated include
* templated app: record holder (controller) class
* templated app: view modules can now be accessed via cast
* templated app: remove unused includes
* templated app: fix return code

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

@@ -0,0 +1,43 @@
+#pragma once
+#include "generic-view-module.h"
+#include <gui/modules/submenu.h>
+
+class SubmenuVM : public GenericViewModule {
+public:
+    SubmenuVM();
+    ~SubmenuVM() final;
+    View* get_view() final;
+    void clean() final;
+
+    /**
+     * @brief Add item to submenu
+     * 
+     * @param label - menu item label
+     * @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(
+        const char* label,
+        uint32_t index,
+        SubmenuItemCallback callback,
+        void* callback_context);
+
+    /**
+     * @brief Set submenu item selector
+     * 
+     * @param index index of the item to be selected
+     */
+    void set_selected_item(uint32_t index);
+
+    /**
+     * @brief Set optional header for submenu
+     * 
+     * @param header header to set
+     */
+    void set_header(const char* header);
+
+private:
+    Submenu* submenu;
+};