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/dialogs/dialogs_module_message.h

@@ -0,0 +1,12 @@
+#pragma once
+#include "dialogs_message.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+DialogMessageButton dialogs_app_process_module_message(const DialogsAppMessageDataDialog* data);
+
+#ifdef __cplusplus
+}
+#endif