Also correctly report device disconnection if Upstream polls too slowly.
Conflicts:
Downstream/Src/downstream_statemachine.c
Upstream/Middlewares/ST/STM32_USB_Device_Library/Class/MSC/Src/usbd_msc_scsi.c
(Upstream). Also implemented read-only mass storage mode.
Todo:
- Test. Everything!!!
- Report write protect flag in SCSI "mode parameter header" (whatever
that is)