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_sd.h

@@ -0,0 +1,33 @@
+/**
+ * @file furi_hal_sd.h
+ * SD Card HAL API
+ */
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <furi_hal_spi_types.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Init SD card detect
+ */
+void hal_sd_detect_init(void);
+
+/** Set SD card detect pin to low
+ */
+void hal_sd_detect_set_low(void);
+
+/** Get SD card status
+ *
+ * @return     true if SD card present, false if SD card not present
+ */
+bool hal_sd_detect(void);
+
+/** Pointer to currently used SPI Handle */
+extern FuriHalSpiBusHandle* furi_hal_sd_spi_handle;
+
+#ifdef __cplusplus
+}
+#endif