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

applications/gpio/gpio_app.c

@@ -1,7 +1,7 @@
 #include "gpio_app_i.h"
 
 #include <furi.h>
-#include <furi-hal.h>
+#include <furi_hal.h>
 
 static bool gpio_app_custom_event_callback(void* context, uint32_t event) {
     furi_assert(context);

applications/gpio/gpio_app_i.h

@@ -10,8 +10,8 @@
 #include <gui/view_dispatcher.h>
 #include <gui/scene_manager.h>
 #include <gui/modules/submenu.h>
-#include <notification/notification-messages.h>
-#include <gui/modules/variable-item-list.h>
+#include <notification/notification_messages.h>
+#include <gui/modules/variable_item_list.h>
 #include "views/gpio_test.h"
 #include "views/gpio_usb_uart.h"
 

applications/gpio/gpio_item.c

@@ -1,6 +1,6 @@
 #include "gpio_item.h"
 
-#include <furi-hal-resources.h>
+#include <furi_hal_resources.h>
 
 typedef struct {
     const char* name;

applications/gpio/gpio_item.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <furi-hal-gpio.h>
+#include <furi_hal_gpio.h>
 
 #define GPIO_ITEM_COUNT 8
 

applications/gpio/scenes/gpio_scene_start.c

@@ -1,5 +1,5 @@
 #include "../gpio_app_i.h"
-#include "furi-hal-power.h"
+#include "furi_hal_power.h"
 
 enum GpioItem {
     GpioItemUsbUart,

applications/gpio/scenes/gpio_scene_usb_uart_config.c

@@ -1,6 +1,6 @@
 #include "../usb_uart_bridge.h"
 #include "../gpio_app_i.h"
-#include "furi-hal.h"
+#include "furi_hal.h"
 
 typedef enum {
     UsbUartLineIndexVcp,

applications/gpio/usb_uart_bridge.c

@@ -1,7 +1,7 @@
 #include "usb_uart_bridge.h"
-#include "furi-hal.h"
+#include "furi_hal.h"
 #include <stream_buffer.h>
-#include <furi-hal-usb-cdc_i.h>
+#include <furi_hal_usb_cdc_i.h>
 #include "usb_cdc.h"
 
 #define USB_CDC_PKT_LEN CDC_DATA_SZ

applications/gpio/views/gpio_usb_uart.c

@@ -1,6 +1,6 @@
 #include "../usb_uart_bridge.h"
 #include "../gpio_app_i.h"
-#include "furi-hal.h"
+#include "furi_hal.h"
 #include <gui/elements.h>
 
 struct GpioUsbUart {