Singleplayer Jitter Fix: Smooth Entity Animations

Ever since beta 1.3 the game has been PLAGUED by this very controlversion change: The client- serveer split.

If you dont know even on singleplayer your client runs a internal SERVER!

This causes a slew of desyncs and jittery behavior that is completley avoidable in single player.

This mod is simple in scope and simply addresses this issue with a series of targeted chanfes that fix all known smoothness issues.

Changes:

• Server and Client now tick in alternating mode. one tick one, one the other
• All entities "send" their position every tick. this means they are always 1 tick behind as opposed to several in vanilla
• Fixes entities spawned in wrong phase staritng on client with a wrong position causing entity snapback when server updates them
• Fixes falling blocks disappearing as soon as the block is placed. Now they disappear when the chunk mesh has hpdated instead, perfectluy smooth.