Networking Rework

Improvements:

• The networking rework is in! It should be much less buggy now and much easier to extend. This was a very necessary improvement that should pave the way for all the new features we have planned!
• Poses! We've added sticker sets and poses. While a sticker is selected, press right-click in order to cycle through different stickers in the same set. This won't work for touch controls just yet, but we are working on a new mobile input system that should feel much better, so keep an eye out! We will also have much better cursor hotspot accuracy in the next update (long overdue).