Removed UIMenuController for editing sprites, added a way to select sprites in the canvas, and added the sprite editing to the toolbar.
Modified the sprite editing to lock all sprites but the one being edited.
Merge branch 'master' into edit-toolbar
Fixed Galaga JSON.
Removed duplicate line.
Factored out some code and removed empty method.
Merge pull request #74 from ZuseApp/edit-toolbar

Edit toolbar