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/lfrfid/helpers/decoder_gpio_out.h

@@ -0,0 +1,14 @@
+#pragma once
+#include <stdint.h>
+#include <atomic>
+
+class DecoderGpioOut {
+public:
+    void process_front(bool polarity, uint32_t time);
+
+    DecoderGpioOut();
+    ~DecoderGpioOut();
+
+private:
+    void reset_state();
+};