Update version number to 2.20.0

use jurplel/install-qt-action internal cache

22w15a

add Chest Boats (introduced already in 22w12a, but last change here)

update version number for release 2.18.0

Release for Minecraft 1.17

added dlls to installer

fixed a color assertion failure

prepped for 2.1 release

prepped for 2.0.1 release

Reoriented directions, fixed lighting and cavemode