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/ibutton/scene/ibutton_scene_select_key.cpp

@@ -0,0 +1,20 @@
+#include "ibutton_scene_select_key.h"
+#include "../ibutton_app.h"
+#include "../ibutton_event.h"
+#include "../ibutton_key.h"
+
+void iButtonSceneSelectKey::on_enter(iButtonApp* app) {
+    // Process file_select return
+    if(app->load_key()) {
+        app->switch_to_next_scene(iButtonApp::Scene::SceneSavedKeyMenu);
+    } else {
+        app->switch_to_previous_scene();
+    }
+}
+
+bool iButtonSceneSelectKey::on_event(iButtonApp* app, iButtonEvent* event) {
+    return false;
+}
+
+void iButtonSceneSelectKey::on_exit(iButtonApp* app) {
+}