Squashed 'scripts/upandaway/wicker/' changes from 01eb1d8..5bb5b5e

5bb5b5e better tile adding

git-subtree-dir: scripts/upandaway/wicker
git-subtree-split: 5bb5b5ef1a6a1b7d29bef463dd2907580551b494
Better tile adding in wicker.

Not there's no need to declare tile assets in the mod. They'll be
permanently loaded in the world entity itself, making gameplay smoother.