Add maximum velocity and max. Acceleration/deceleration to SoftMotion axis property page

[swenp]

I think the configuration property pages for SoftMotion axes are missing the parameters for maximum velocity, maximum acceleration and deceleration for individual axes.

When performing single axes moves it is somehow easy to control these parameters because they are wired to the appropriate property nodes when configuring the move itself.

But when performing moves with axes in a coordinate space the move parameters given are for the resulting vector, resulting in unknown velocities for the individual axes.

When configuring the maximum velocity and acceleration/deceleration for an axis there should be the option to

a) Generate an error when the requested move can not be solved within the limits

b) Coerce the limiting value to its maximum and solve the move using the new values, generate a warning