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

lib/app-scened-template/text_store.h

@@ -0,0 +1,12 @@
+#pragma once
+#include <stdint.h>
+
+class TextStore {
+public:
+    TextStore(uint8_t text_size);
+    ~TextStore();
+
+    void set(const char* text...);
+    const uint8_t text_size;
+    char* text;
+};