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.h

@@ -17,8 +17,8 @@
 #include <furi/valuemutex.h>
 #include <furi/log.h>
 
-#include <furi-hal-gpio.h>
-#include <furi-hal/api-interrupt-mgr.h>
+#include <furi_hal_gpio.h>
+#include <furi_hal/api_interrupt_mgr.h>
 
 #include <stdlib.h>