Issues with dropped force step.

[zonkmachine]

Since #3003 / 02eee8e
@lukas-w @jasp00

1. Some floats now needs to be rounded off in presentation. Click and drag Vol/Pan knobs and see the floats in all their glory. Used to be rounded to one decimal precision.
2. The integers values that use float models?

[jasp00]

In AutomatableModel, m_hasStrictStepSize should be dropped, and m_step should be used as a restriction from the model, i.e., set m_step to 0 in many float models. m_step is currently being used as a restriction from the view; this rounding to one decimal should be in the view.

[smithjessk]

If #3075 is a good solution for the knobs, I would be happy to extend it to other controls.

[BaraMGB]

A better solution would be to add a new function to Knobs and fader which gives the value truncated. Intern the model uses the untruncated value for sample exact calculations.