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/furi_hal/furi_hal_uart.h

@@ -0,0 +1,77 @@
+/**
+ * @file furi_hal_uart.h
+ * @version 1.0
+ * @date 2021-11-19
+ * 
+ * UART HAL api interface
+ */
+#pragma once
+
+#include <stddef.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * UART channels
+ */
+typedef enum {
+    FuriHalUartIdUSART1,
+    FuriHalUartIdLPUART1,
+} FuriHalUartId;
+
+/**
+ * UART events
+ */
+typedef enum {
+    UartIrqEventRXNE,
+    UartIrqEventIDLE,
+    //TODO: more events
+} UartIrqEvent;
+
+/**
+ * Init UART
+ * Configures GPIO to UART function, сonfigures UART hardware, enables UART hardware
+ * @param channel UART channel
+ * @param baud baudrate
+ */
+void furi_hal_uart_init(FuriHalUartId channel, uint32_t baud);
+
+/**
+ * Deinit UART
+ * Configures GPIO to analog, clears callback and callback context, disables UART hardware
+ * @param channel UART channel
+ */
+void furi_hal_uart_deinit(FuriHalUartId channel);
+
+/**
+ * Changes UART baudrate
+ * @param channel UART channel
+ * @param baud baudrate
+ */
+void furi_hal_uart_set_br(FuriHalUartId channel, uint32_t baud);
+
+/**
+ * Transmits data
+ * @param channel UART channel
+ * @param buffer data
+ * @param buffer_size data size (in bytes)
+ */
+void furi_hal_uart_tx(FuriHalUartId channel, uint8_t* buffer, size_t buffer_size);
+
+/**
+ * Sets UART event callback
+ * @param channel UART channel
+ * @param callback callback pointer
+ * @param context callback context
+ */
+void furi_hal_uart_set_irq_cb(
+    FuriHalUartId channel,
+    void (*callback)(UartIrqEvent event, uint8_t data, void* context),
+    void* context);
+
+#ifdef __cplusplus
+}
+#endif