[Feature] Enable a way to renumber / remap groups in generated GTBs for MIDI 1.0 devices especially

[Psychlist1972]

The cable numbers we map to groups may not always result in an appropriate MIDI CI pairing. There will be times when the user needs to be able to remap these through the settings application.

This may require generating function blocks (and having a service-side responder for it) as well as message translation, and use that information to override the Group Terminal Blocks.

This may be useful for MIDI 2.0 devices, but the priority is MIDI 1.0 devices.