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/f6/ble_glue/serial_service.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+
+#define SERIAL_SVC_DATA_LEN_MAX (486)
+#define SERIAL_SVC_CHAR_VALUE_LEN_MAX (243)
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef enum {
+    SerialServiceEventTypeDataReceived,
+    SerialServiceEventTypeDataSent,
+} SerialServiceEventType;
+
+typedef struct {
+    uint8_t* buffer;
+    uint16_t size;
+} SerialServiceData;
+
+typedef struct {
+    SerialServiceEventType event;
+    SerialServiceData data;
+} SerialServiceEvent;
+
+typedef uint16_t (*SerialServiceEventCallback)(SerialServiceEvent event, void* context);
+
+void serial_svc_start();
+
+void serial_svc_set_callbacks(
+    uint16_t buff_size,
+    SerialServiceEventCallback callback,
+    void* context);
+
+void serial_svc_notify_buffer_is_empty();
+
+void serial_svc_stop();
+
+bool serial_svc_is_started();
+
+bool serial_svc_update_tx(uint8_t* data, uint16_t data_len);
+
+#ifdef __cplusplus
+}
+#endif