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/bt/bt_service/bt.c

@@ -2,7 +2,7 @@
 #include "battery_service.h"
 #include "bt_keys_storage.h"
 
-#include <applications/notification/notification-messages.h>
+#include <applications/notification/notification_messages.h>
 
 #define TAG "BtSrv"
 

applications/bt/bt_service/bt_i.h

@@ -3,7 +3,7 @@
 #include "bt.h"
 
 #include <furi.h>
-#include <furi-hal.h>
+#include <furi_hal.h>
 
 #include <gui/gui.h>
 #include <gui/view_port.h>

applications/bt/bt_service/bt_keys_storage.c

@@ -1,6 +1,6 @@
 #include "bt_keys_storage.h"
 #include <furi.h>
-#include <file-worker.h>
+#include <file_worker.h>
 
 #define BT_KEYS_STORAGE_TAG "bt keys storage"
 #define BT_KEYS_STORAGE_PATH "/int/bt.keys"