Make color edit non-modal
Increase default max item stack
Handle invalid item ID when saving item
GUI tweaks
Support adding/removing appearance colors
Workaround issues with appearance color editing
Fix bugs with option editing, disable image browser
Add image browser to tools menu

Still issues with it, modal item edit dialog locks it which
is pretty useless. Can't make it work without self var for some
reason but that's not a big deal.
Add export mod list button
Show setup dialog if no players found
Remove unused imports
Prepare release