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.cpp

@@ -0,0 +1,18 @@
+#include "text_store.h"
+#include <furi.h>
+
+TextStore::TextStore(uint8_t _text_size)
+    : text_size(_text_size) {
+    text = static_cast<char*>(malloc(text_size + 1));
+}
+
+TextStore::~TextStore() {
+    free(text);
+}
+
+void TextStore::set(const char* _text...) {
+    va_list args;
+    va_start(args, _text);
+    vsnprintf(text, text_size, _text, args);
+    va_end(args);
+}