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/scened_app_example/scened_app.cpp

@@ -0,0 +1,20 @@
+#include "scened_app.h"
+#include "scene/scened_app_scene_start.h"
+#include "scene/scened_app_scene_byte_input.h"
+
+ScenedApp::ScenedApp()
+    : scene_controller{this}
+    , text_store{128}
+    , notification{"notification"} {
+}
+
+ScenedApp::~ScenedApp() {
+}
+
+void ScenedApp::run() {
+    scene_controller.add_scene(SceneType::Start, new ScenedAppSceneStart());
+    scene_controller.add_scene(SceneType::ByteInputScene, new ScenedAppSceneByteInput());
+
+    notification_message(notification, &sequence_blink_green_10);
+    scene_controller.process(100);
+}