Add host support for CMDR-CBMDOS's seekable read/write files #435
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This adds host filesystem support for M-mode files, which support arbitrary read/writes, and the SD2IEC form of the P command which allows seeking within them.
One thing I'm uncertain about: I had to hack around CR termination of the P command because it takes binary arguments, and terminating the command on a $0d would cause odd results if one of the parameters was $0d.
I feel like the right thing to do here is to change the command parsing stuff to only execute commands on an UNLSN, but I don't know whether that's actually valid. I can't find any formal specification of how DOS commands work. Would this be safe?