[direct df] Replace QEMU kluge with implied seek option for 360k/1.2M floppies #1741
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Replaces
QEMU_STRETCH_FIXwithUSE_IMPLIED_SEEKoption to use implied seek operation to overcome QEMU track doubling bug when using 360k floppies in 1.2M drives. Not enabled for real hardware. Uses code developed and tested by @Mellvik from Mellvik/TLVC#29.Also adds improved source code comments from @Mellvik's same commit, as well as its change to always reset FDC at startup, regardless of chip type.