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_rtc.h

@@ -0,0 +1,72 @@
+/**
+ * @file furi_hal_rtc.h
+ * Furi Hal RTC API
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <main.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+    // Time
+    uint8_t hour; /**< Hour in 24H format: 0-23 */
+    uint8_t minute; /**< Minute: 0-59 */
+    uint8_t second; /**< Second: 0-59 */
+    // Date
+    uint8_t day; /**< Current day: 1-31 */
+    uint8_t month; /**< Current month: 1-12 */
+    uint16_t year; /**< Current year: 2000-2099 */
+    uint8_t weekday; /**< Current weekday: 1-7 */
+} FuriHalRtcDateTime;
+
+typedef enum {
+    FuriHalRtcFlagDebug = (1 << 0),
+    FuriHalRtcFlagFactoryReset = (1 << 1),
+    FuriHalRtcFlagLock = (1 << 2),
+} FuriHalRtcFlag;
+
+typedef enum {
+    FuriHalRtcRegisterBoot,
+    FuriHalRtcRegisterBootVersion,
+    FuriHalRtcRegisterSystem,
+    FuriHalRtcRegisterSystemVersion,
+    FuriHalRtcRegisterLfsFingerprint,
+    FuriHalRtcRegisterFaultData,
+} FuriHalRtcRegister;
+
+/** Initialize RTC subsystem */
+void furi_hal_rtc_init();
+
+uint32_t furi_hal_rtc_get_register(FuriHalRtcRegister reg);
+
+void furi_hal_rtc_set_register(FuriHalRtcRegister reg, uint32_t value);
+
+void furi_hal_rtc_set_log_level(uint8_t level);
+
+uint8_t furi_hal_rtc_get_log_level();
+
+void furi_hal_rtc_set_flag(FuriHalRtcFlag flag);
+
+void furi_hal_rtc_reset_flag(FuriHalRtcFlag flag);
+
+bool furi_hal_rtc_is_flag_set(FuriHalRtcFlag flag);
+
+void furi_hal_rtc_set_datetime(FuriHalRtcDateTime* datetime);
+
+void furi_hal_rtc_get_datetime(FuriHalRtcDateTime* datetime);
+
+bool furi_hal_rtc_validate_datetime(FuriHalRtcDateTime* datetime);
+
+void furi_hal_rtc_set_fault_data(uint32_t value);
+
+uint32_t furi_hal_rtc_get_fault_data();
+
+#ifdef __cplusplus
+}
+#endif