Fixes gem mine desert palette.
Merge pull request #5987 from reaperrr/gem-mine-palette

Fixes gem mine desert palette
Fix frozen actors being targetable under shroud. Fixes #5979, #5978.
Merge pull request #5989 from pchote/frozen-target-fix

Fix frozen actors being targetable under shroud.
Fix scripted paradrops.
Fix old-lua paradrop too.