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/state_sequencer.h

@@ -0,0 +1,25 @@
+#pragma once
+#include "stdint.h"
+#include <list>
+#include <functional>
+
+class TickSequencer {
+public:
+    TickSequencer();
+    ~TickSequencer();
+
+    void tick();
+    void reset();
+    void clear();
+
+    void do_every_tick(uint32_t tick_count, std::function<void(void)> fn);
+    void do_after_tick(uint32_t tick_count, std::function<void(void)> fn);
+
+private:
+    std::list<std::pair<uint32_t, std::function<void(void)> > > list;
+    std::list<std::pair<uint32_t, std::function<void(void)> > >::iterator list_it;
+
+    uint32_t tick_count;
+
+    void do_nothing();
+};