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

firmware/targets/furi_hal_include/furi_hal_random.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Get random value
+ *
+ * @return     random value
+ */
+uint32_t furi_hal_random_get();
+
+/** Fill buffer with random data
+ *
+ * @param      buf  buffer pointer
+ * @param      data buffer len
+ */
+void furi_hal_random_fill_buf(uint8_t* buf, uint32_t len);
+
+#ifdef __cplusplus
+}
+#endif