refactor(Typescript): move typescript types into root types/ path

- Add pow library types (backbone,jquery,express,underscore)
feat(TileMap): load and parse Tiled map xml file

- add getDirName(path) to IAppPlatform.
- add skeleton loading and parsing implementation.
- add ITiledMap interfaces to define the object structure.
refactor(TileMap): fix errors in loading tile set images and xml
fix(TileMap): successfully load and render combat and sewer maps

- Use Pixi display object containers for each layer, and give each tile its own Sprite.