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

applications/accessor/scene/accessor_scene_start.h

@@ -0,0 +1,9 @@
+#pragma once
+#include "accessor_scene_generic.h"
+
+class AccessorSceneStart : public AccessorScene {
+public:
+    void on_enter(AccessorApp* app) final;
+    bool on_event(AccessorApp* app, AccessorEvent* event) final;
+    void on_exit(AccessorApp* app) final;
+};