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

core/furi/stdglue.c

@@ -5,7 +5,7 @@
 #include <FreeRTOS.h>
 #include <task.h>
 
-#include <furi-hal.h>
+#include <furi_hal.h>
 #include <m-dict.h>
 
 DICT_DEF2(