Beyond The End - Optimization and Fixes

Fix GeckoLib ticking models flickering in GUI previews

GeckoLib "ticking" models (AnimatedTickingGeoModel), such as Mutant
More's Mutant Shulker, flickered in the Just Enough Resources preview in
JEI. Their animation clock is tickTimer() + partialTick, and tickTimer()
returns the entity's tickCount. GUI entities never tick, so the clock only
moved by the partial tick and went back every tick, making the animation
jump back and forth.

For entities that are not in the world the client level's game time is
now used instead, as AnimatedGeoModelGuiTickMixin already does for
regular GeckoLib models. Entities in the world are unchanged.

GeckoLib 3.1.40 is added as a local compileOnly jar for the
IAnimationTickable type.