[directfd] Add cache to end of cylinder option #2097
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Adds CACHE_CYLINDER option to direct FD driver to cache until end of cylinder instead of end of track. Additional CACHE_CYLINDER_MAX define sets maximum sector count of cylinder cache (currently 12 = 6K).
DF driver now supports full track, track split block, full cylinder and partial (fixed size until end of cylinder) caching, as well supporting floppies of any sector count. Most of these options are likely to be used only for performance testing the floppy I/O subsystem.
Next step will be automatic disabling of cache for 386+ systems.
Discussed in Mellvik/TLVC#88 (comment) and tested on QEMU.