[JWN] Just what is needed

First alpha in 1.21.

P.S: If you had stutters that you should edit number of cores\threads in config. If you don't have stutters, that should don't edit, or you can change number of cores\threads in default number.

Temporarily removed Memory leak fix, Exordium, Bedrodium, Staaaaaaaaaaaack, CIT Resewn, LambDynamicLights, ReplayMod, Better Biome ReBlend, More Culling, ClickThrough, LambDynamicLights, Cubes Without Borders