Smarter chunk loading

Small fix & change default draw distance

Even more optimization

Merge branch 'main' of https://github.com/Sirvoid/Midless

World Generation, Chat, Optimizations and stuff

Multithreading, Lightning, Sprites, UI, ...

Added:
-Chunks built on another thread
-Lightning
-Sprite blocks
-Menu and in game UI
-Started working on multiplayer using ENet (Server code not available as of now)
-Save singleplayer world
-other tweaks

Update readme