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/storage/storage.c

@@ -1,10 +1,10 @@
 #include "storage.h"
-#include "storage-i.h"
-#include "storage-message.h"
-#include "storage-processing.h"
-#include "storage/storage-glue.h"
-#include "storages/storage-int.h"
-#include "storages/storage-ext.h"
+#include "storage_i.h"
+#include "storage_message.h"
+#include "storage_processing.h"
+#include "storage/storage_glue.h"
+#include "storages/storage_int.h"
+#include "storages/storage_ext.h"
 
 #define STORAGE_TICK 1000