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.cpp

@@ -0,0 +1,15 @@
+#include "decoder_gpio_out.h"
+#include <furi.h>
+#include <furi_hal.h>
+
+void DecoderGpioOut::process_front(bool polarity, uint32_t time) {
+    hal_gpio_write(&gpio_ext_pa7, polarity);
+}
+
+DecoderGpioOut::DecoderGpioOut() {
+    hal_gpio_init_simple(&gpio_ext_pa7, GpioModeOutputPushPull);
+}
+
+DecoderGpioOut::~DecoderGpioOut() {
+    hal_gpio_init_simple(&gpio_ext_pa7, GpioModeAnalog);
+}