Implement a T parameter for setting the max speed as nominal move time.
Implement a T parameter for setting the max speed as nominal move time.

This allows specifying the maximum speed independent of a particular definition of distance.
The maximum speed will be the speed at which the move would be performed if took exactly T seconds at constant speed. In reality it will take at least T time but may take longer due to accelerations and axis speed limits.
In other words, the segment-relative speed will be limited to 1/T [segments per second].

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