feat(examples): add example maps

- BrowserQuest full map and a cropped smaller map.  Good for performance testing.  Currently, full map load is super slow.
- EBURP maps that were ported to Tiled format for use in Pow2.  Were later removed.
- Pow2 whatever crap maps I have put together for pow2 at the time.

Would be great to have some other open source Tiled maps to bundle as examples.