Fast world loading

Problem

Loading worlds takes a lot of time.

Solution

Add these two features from LabyMod:

Additional context

In Sol client or Vanilla it takes 5 seconds to load a world on 5 render distance, but on LabyMod with those features turned on it's instant (even with higher render distances)

[TheKodeToad]

We already have "Fast world loading" - it's just enabled by default (for those curious it simply removes the gc call).