Rework +%/-% so you can double-press with manual fade.

I used to use +%/-% quite a bit, but often would double-press to get to the value I wanted.

Unfortunately the way it currently operates, the second +% press will add to the value of the fixture mid-fade.

For example, Ch 1 starts at 50%, with +% set to 5% increments. Pressing +% twice should bring the fixture to 60%, but instead will normally bring to 57% or thereabouts, depending on how quick the +% button is pressed the second time.

I've determined programmer fades are more important but I'd love to be able to re-incorporate +% into my workflow.