Add setting: Max pop height for manuals and grinds.

Resurrecting this thread, I really hope we get the option for more realistic pop heights one day. The current setup is cool for tricklining and just casual stick flicking but looks horrible for filmers. There are techniques and certain tricks you can use to get lower pop but it'd be so much nicer to have a slider for pop height out of mannies and grinds, maybe even an overall max pop height too.