separate parameter settings for acceleration and deceleration

[JanBluePix]

Entering a new value for a acceleration as deceleration after the acceleration is done works as described in Issue 118. Setting a separate value for acceleration and deceleration would be nicer though.

[gin66]

Agree, that this would be nicer for some applications. Unfortunately based on current structure of the ramp generator, this is a quite complex endeavor. So there is no plan to start implementation in the coming weeks and more likely even months.

PRs are surely welcome.