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/check.c

@@ -1,7 +1,7 @@
 #include "check.h"
-#include "furi-hal-task.h"
-#include <furi-hal-console.h>
-#include <furi-hal-rtc.h>
+#include "furi_hal_task.h"
+#include <furi_hal_console.h>
+#include <furi_hal_rtc.h>
 #include <stdio.h>
 
 __attribute__((always_inline)) inline static void __furi_print_name() {

core/furi/log.c

@@ -1,7 +1,7 @@
 #include "log.h"
 #include "check.h"
 #include <cmsis_os2.h>
-#include <furi-hal.h>
+#include <furi_hal.h>
 
 #define FURI_LOG_LEVEL_DEFAULT FuriLogLevelInfo
 

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(