Naming and coding style convention, new linter tool. (#945)

* Makefile, Scripts: new linter
* About: remove ID from IC
* Firmware: remove double define for DIVC/DIVR
* Scripts: check folder names too. Docker: replace syntax check with make lint.
* Reformat Sources and Migrate to new file naming convention
* Docker: symlink clang-format-12 to clang-format
* Add coding style guide

lib/app-scened-template/view_modules/submenu_vm.h

@@ -0,0 +1,42 @@
+#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
+     */
+    void 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;
+};