Glasgow Embedded / Glasgow - History

applet.shugart_floppy: implement MFM image indexing.

Indexing as in it gives you an index of the sectors it found in
the disk image. It does decode the data and verify CRC too, but
doesn't save the decoded bytes anywhere.

cli: add `glasgow tool`, for running offline applet functionality.

Offline as in no Glasgow hardware required.

applet.shugart_floppy: interleave tracks from both sides.

This gives us "LBA" (really logical track addressing) that seems
consistent with what Linux &c use... of course, FAT12 uses CHS
directly.

applet.shugart_floppy: eliminate K.C2 sync, update docs.

K.C2 actually *can* be produced by normal data. Not sure what is
even the point of having it...

applet.shugart_floppy: bring diagram in line with PLL algorithm.

applet.shugart_floppy: improve dirty clock recovery, fix docs.

applet.shugart_floppy: new applet.

Currently features (software) PLL, (software) MFM demodulator,
and only raw reads. More to come!