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/ibutton.cpp

@@ -1,4 +1,4 @@
-#include "ibutton-app.h"
+#include "ibutton_app.h"
 
 // app enter function
 extern "C" int32_t ibutton_app(void* p) {