Create new improved TiledTileSet and TiledTileMap assets

[AndreasHefti]

Create specified Tiled tileset and map properties for Firefly integration
For TileSet add possibility to refer to a collision map image that is used to create collision bitmaps for tiles
Specify and build new object layer integration with possibility of exit triggers

Create tests and examples for Tiled tile sets integration
Create tests and examples for Tiled tile map integration