Fixed hand pop in when grabbing things while model turned off

1) Added options menu during pause screen when you press "Escape". It's in the bottom of your screen. Check screenshot in workshop.
2) Options menu has voxel limit slider for liquifying huge objects! Enjoy :)
3) Added option to remove hand model. Like this you can liquify as fast as possible without animation.
4) Liquifying happens with "left mouse button" now, since so many of you were whining ("MMB" still works for backwards compatibility)
5) Very big objects can be liquified but if I didn't optimize it, it would crash your game. Which is why big objects don't spawn all the voxels they are comprised of.
6) Gravity toggle now works even if you don't have the Liquify tool equpped.