Control Swap

Changelog:

• more updates to position and look angle per second, meaning more accurate spectating (yay!)
• more precise looking angle
• added a 3 second note block sound countdown just before the swap (can change volume in sound settings)
• the Control Swap timer now pauses when there is only one player left on the team
• added nether portal animation for spectators
• death screen now shows for spectators (though they can't respawn)
• screen now darkens for spectators as well when sleeping
• performance improvement for transferring owned mobs across swap

Bugfixes:

• fixed freelook mods being broken
• fixed getting out of beds on a swap
• fixed permanently sneaking on swap (visual bug)
• fixed spectators being able to see hand when rowing a boat
• fixed spectators being able to see held item when the body was in the spectator gamemode
• /controlswap start no longer forces survival mode
• ender chests now follow shared inventory logic
• pause menu and chat no longer close unexpectedly when swapping to spectate