Still to do:
- Handle tile priorities in ISO sorting.
- Handle recoloring tiles (this may result in annoyingly significant changes to Tile/TileSet API)
- Dynamically loading sections rather than loading all the tiles of a scene.
- Better handling of the state where the scene's not yet loaded.
- Portals.
- Dynamic sizing of the MisoScenePanel
git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@932 ed5b42cb-e716-0410-a449-f6a68f950b19