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/gui/modules/button_panel.c

@@ -1,5 +1,5 @@
 #include "button_panel.h"
-#include "furi-hal-resources.h"
+#include "furi_hal_resources.h"
 #include "gui/canvas.h"
 #include <m-array.h>
 #include <m-i-list.h>

applications/gui/modules/variable_item_list.c

@@ -1,4 +1,4 @@
-#include "variable-item-list.h"
+#include "variable_item_list.h"
 #include "gui/canvas.h"
 #include <m-array.h>
 #include <furi.h>

applications/gui/modules/variable_item_list.h

@@ -1,5 +1,5 @@
 /**
- * @file variable-item-list.h
+ * @file variable_item_list.h
  * GUI: VariableItemList view module API
  */