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_debug/lfrfid_debug_app_launcher.cpp

@@ -0,0 +1,10 @@
+#include "lfrfid_debug_app.h"
+
+// app enter function
+extern "C" int32_t lfrfid_debug_app(void* p) {
+    LfRfidDebugApp* app = new LfRfidDebugApp();
+    app->run();
+    delete app;
+
+    return 0;
+}