[ENHANCEMENT] M204 T support

[wavexx]

Printer type - MK3S, MK3, MK2.5S, MK2.5, MK2S
MMU Upgrade - N/A

Is your enhancement related to a problem? Please describe.
M204 supports both the old (M204 S*) and the "new format" acceleration settings which allows for separate printing and travel acceleration (M204 P/T).

M204 T is, however, completely ignored. This results in M204 P setting acceleration for both, as for the legacy S code, which is acceptable (as it's fail-safe), but not correct.

Describe the solution you'd like
It wouldn't be hard to follow upstream Marlin and fix a couple of internal TODO's along the way.

[wavexx]

This was implemented and merged in #2838