applet.interface.sbw_probe: convert to nMigen.

applet.interface.sbw_probe: version→jtag_id. NFC

applet: fix repl format conversion

applet.interface.spi_controller: change clock name to 'sck'

update SPI signal terms to COPI / CIPO

applet.audio.yamaha_opx: add optional /IC support. OPM with /IC connected produces 100% reproducible DAC bitstream.

applet.audio.yamaha_opx: fix error shown for missing Content-Length. Also, fix error code for VGM playback error.

applet.audio.yamaha_opx: gracefully report VGM parsing errors.

protocol.vgm: show file offset when encountering unknown commands.

support.task_queue: clear done queue after cancellation. Since .cancel() waits until all live tasks are done, it is likely that the done queue will contain some cancelled tasks. If the done queue is not cleared, then the next poll()/wait_one()/wait_all() call will cancel the caller, which usually silently terminates it. In any case, semantically .cancel() discards the results of all tasks in the queue even if they completed before they were cancelled. This bug was introduced in commit a7d041f4. Fixes #202. Co-authored-by: Filipe Laíns