Add option to use grab-and-move action for scrolling

[haoxv]

Ring to thumb pinch and little finger to thumb pinch are not reliable for many head set. This change adds option to use grab (pinch) and move gesture to imitate scrolling and knob turning. This is espeically useful for MSFS 2020 as it does not support touch screen. The feature is enabled when "Pinch to scroll" is disabled in HTCCSettings.

[fredemmott]

Thanks, this is a great start :)

1. this needs a separate option in both the UI and the registry: there are controls in some planes that must be held, but also support scrolling - so there needs to be a way to disable this. I don't think there's a reasonable jitter value that won't have a large amount of either false positives or negatives, so I think this needs to be user preference

2. use clang-format. If you're using an IDE, its' code formatting option will probably use clang-format as thhere's a .clang-format file

[haoxv]

Can we reuse Config::PinchToScroll to differentiate between different gestures for scrolling, use ring and little finger pinch if true, and index finger pinch and move if false? Or we add another reg item GrabMovetoScroll and keep PinchToScroll always true?

[fredemmott]

Sorry for the delay; I think this should be a separate option.

PinchToScroll should be entirely independent, and only affect other fingers