Explicitly show which axes are affected on the status line when a crash
has been detected.
When the crash recovery prompt is triggered, also show all axes which
have been affected during the detection interval (currently X, Y, or
both).
The timer detection has been simplified to match the MK3 optical
filament timeout handling, which makes more sense: a crash immediately
following a crash recovery prompt will trigger the prompt again. The
timer needs to properly expire in order to reset the crash count.
This helps crash detection tuning (and help users reporting issues with
crash detection) without having to monitor the serial line.
This currently abuses the MSG_CRASH_DETECTED message by prepending the
[X][Y] labels to the message, which is ok in english but might not
translate that well for all languages.
