Vanilla Smoothie

* Now compatible with the 1.21.8 update

I finally decided to take a look at some of the stuff I had left behind, by error or lack of time/interest; in particular I added (o fixed) some natural blocks like grass and some bushes.

Another "big" thing is that I finally tried to make the lava animations; they're far from perfect but at least they are now consistent with the rest.

-- Vegetation:

• Grass, tall grass, dry grass, tall dry grass
• bush, dead bush, firefly bush
• fern, large fern
• acacia leaves, azalea leaves
• vines
• pale oak hanging moss
• pale oak foliage particles
• glow lichen

-- GUI:

• interface buttons
• various fixes to panels

-- Other:

• fix to armors
• happy ghast harness
• lava still and flow animations