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/lfrfid/scene/lfrfid_app_scene_select_key.cpp

@@ -0,0 +1,18 @@
+#include "lfrfid_app_scene_select_key.h"
+
+void LfRfidAppSceneSelectKey::on_enter(LfRfidApp* app, bool need_restore) {
+    if(app->load_key_from_file_select(need_restore)) {
+        app->scene_controller.switch_to_next_scene(LfRfidApp::SceneType::SavedKeyMenu);
+    } else {
+        app->scene_controller.switch_to_previous_scene();
+    }
+}
+
+bool LfRfidAppSceneSelectKey::on_event(LfRfidApp* app, LfRfidApp::Event* event) {
+    bool consumed = false;
+
+    return consumed;
+}
+
+void LfRfidAppSceneSelectKey::on_exit(LfRfidApp* app) {
+}