[FL-1857] New USB stack (#735)

* libusb_stm32 USB stack test
* USB: Add dual CDC mode
* USB HID demo, added libusb_stm32 as submodule
* Target F6/F7: remomve unused ll_usb

Co-authored-by: n.minaylov <n.minaylov@flipperdevices.com>
Co-authored-by: Aleksandr Kutuzov <alleteam@gmail.com>

firmware/targets/furi-hal-include/furi-hal-usb.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "usb.h"
+
+typedef enum {
+    UsbModeNone,
+    UsbModeVcpSingle,
+    UsbModeVcpDual,
+    UsbModeHid,
+    UsbModeU2F,
+
+    UsbModesNum,
+} UsbMode;
+
+void furi_hal_usb_init();
+
+void furi_hal_usb_set_config(UsbMode mode);
+
+void furi_hal_usb_disable();
+
+void furi_hal_usb_enable();