Hand interactions

Added general hand interactions for this update. Things like reverse headpats and punches from Natsumi if you piss her off.

Tried to do push interactions as well (the player pushing her but that didn't turn out well and looks very stiff. I need to spend more time adding new animations and specific reactions for it to look good.

Another sorta new addition is gaze reaction. That is, her noticing where you are looking and responding accordingly. It existed before but the code was messy. I reworked that, making future content easier.

There should also be slight performance improvements as I have optimized some parts of the code.

For the next update I plan to rework the animation system. The default unity system works fine for a few animations but as the number increases it quickly becomes a mess. In addition, people have been asking for dialogue ui improvements, since right now it's difficult to read the text and control the dialoguebox position in vr. I'll try to improve on that.