v0.2.1-beta.5

Packages carry their own images and text

An override package can now ship the pictures and names for the content it
adds, so a mod that adds an entity no longer borrows another demon's Toybox
tile or asks you to hand-edit a file every other mod shares.

New

• Packages can ship their own images and their own text.

Improved

• Your own overrides move into a package you can name, share and uninstall.
• An added entity survives a playtest and stays usable in the editor.

Fixed

• Two packages whose names differ only in letter case no longer conflict.

Plus 3 smaller fixes and internal changes.