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/power/power_service/power_api.c

@@ -1,8 +1,8 @@
 #include "power_i.h"
 
 #include <furi.h>
-#include "furi-hal-power.h"
-#include "furi-hal-bootloader.h"
+#include "furi_hal_power.h"
+#include "furi_hal_bootloader.h"
 
 void power_off(Power* power) {
     furi_hal_power_off();