put a folder named "items" with the english named item sprites (tbd if we change to a more sane filename format)
bring your own files, it's like 45 MB so not distributing with the EXE.
Move sprite resources to subfolder for organization
Add FieldItem class (replaces MapItem), might work in a field item editor (similar to building editor)
Decouple itemgrid, itemgrid editor, and item editor as separate user controls
Visualize items with fake icons based on item ID and values
Paged editing for large arrays
add fallback for people wanting old editor (hold control when clicking Edit Items from main editor window)
