MSI Mystic Light Rework

* Direct mode for certain 185-byte boards based on Aleksandr Garashchenko's mystic-why project
  * Improved detector to automatically determine controller type (162 vs 185 byte)
  * Re-enable missing modes and improve mode control
  * Code cleanup

Commits squashed and amended by Adam Honse <calcprogrammer1@gmail.com> as part of !1181
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