[directfd] Add semi-track caching to DF driver #2083
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DF driver now supports no caching (CONFIG_TRACK_CACHE=n), full-track caching (FULL_TRACK=1, starts w/sector 1) and semi-track (FULL_TRACK=0, starts w/requested sector). These differing options have been added to permit future performance testing discussed in Mellvik/TLVC#88.
Considering adding fixed-size cache buffer caching, but need more testing as discussed above. Also probably need to turn off caching altogether for fast (386+ systems) as discussed.
Tested on QEMU w/IODELAY emulation.