Re-enabled the mod to network the current co op logic using steam lobbies and p2p

* Hopefully fixed bug with projectiles getting stuck on screen

*The Endless button in the shop should no longer appear for client players and should work for host players in the shop after wave 19

*Set bonuses should display properly
*Map size factors should now average all players (e.g. Old character effect)
*Going back from selections screens in MP lobbies will now return you to the lobby instead of main menu
*End of wave stat conversion such as demon character should now work

Client rerolls now process their cost
Sync wave timers

Fix crash from mouse movement

Fixed crashed caused by client players buying scared sausage

Fix "Copy Host"

Fix crashes caused by turrets
Fix enemy hp-increasing effects

Elites and hordes will now appear and show correctly for all players