crkbd trackpoint

I added a trackpoint to a corne-cherry (crkbd) keyboard for ergonomic pointing bliss!

Build details: https://github.com/joh/crkbd-trackpoint

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Yes, you're right, I changed the PIO driver directly for that: https://github.com/joh/qmk_firmware/commit/aa0214f5b1b3001cf7cc99419c32c8b87707cb5a

I plan to make it an optional feature for qmk proper, but for now it's somewhat of a hack :)