M30 3-button mode turbo buttons

[RobertDaleSmith]

With the addition of the 3-button mode, turbo functionality had been requested specifically for the M30. For 6-button controllers this makes sense can be done.

Currently the turbo functionality is applied globally and not on a per-device type basis. Turbo I and II get applied to whatever button III and IV are mapped to. Just like the 6-button mode the 3-button mode currently does have turbo button functionality.

A middle ground requested was to simply map the top and bottom row of the 6-button controllers the same when in 3-button mode. As the M30 has its own turbo functionality built-in that can be enabled manually on the top row. ex. III, II, I.