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/desktop/desktop.c

@@ -7,7 +7,7 @@
 #include <furi/pubsub.h>
 #include <furi/record.h>
 #include "portmacro.h"
-#include "storage/filesystem-api-defines.h"
+#include "storage/filesystem_api_defines.h"
 #include "storage/storage.h"
 #include <stdint.h>
 #include <power/power_service/power.h>