[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.h

@@ -33,6 +33,7 @@ template <unsigned int N> struct STOP_EXTERNING_ME {};
 #include "furi-hal-ibutton.h"
 #include "furi-hal-rfid.h"
 #include "furi-hal-nfc.h"
+#include "furi-hal-usb.h"
 
 /** Init furi-hal */
 void furi_hal_init();