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/osc_fsk.cpp

@@ -0,0 +1,20 @@
+#include "osc_fsk.h"
+
+OscFSK::OscFSK(uint16_t _freq_low, uint16_t _freq_hi, uint16_t _osc_phase_max)
+    : freq{_freq_low, _freq_hi}
+    , osc_phase_max(_osc_phase_max) {
+    osc_phase_current = 0;
+}
+
+bool OscFSK::next(bool bit, uint16_t* period) {
+    bool advance = false;
+    *period = freq[bit];
+    osc_phase_current += *period;
+
+    if(osc_phase_current > osc_phase_max) {
+        advance = true;
+        osc_phase_current -= osc_phase_max;
+    }
+
+    return advance;
+}