Rename RomTile module.
Add back old tile module.
Revert to older faster block module.
Update references to RomHelper.
Delete slow, experimental block-tile module.
Store blockset canvases instead of images.
Store and re-use blockset canvases in local storage.
Move ImageFromCanvas class to main.
Use new method of creating tileset images from blockset.
Remove newline.
When loading blockset canvases from local storage, calculate width and height.
Fix bad instantiation of classes.