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

lib/toolbox/version.h

@@ -75,4 +75,3 @@ const uint8_t version_get_target(const Version* v);
 #ifdef __cplusplus
 }
 #endif
-