New Features per User Feedback

[eonarheim]

New tile methods for convenience, all of these methods are also available at the layer level

• TiledResource.getTilesByPoint - Returns any excalibur Tile instances and any metadata for a tile below the world space point provided

• TiledResource.getTileMetadataByClassName - renamed from getTilesByClassname. This returns the Tiled metadata for a tile by classname.

• TiledResource.getTileMetadataByProperty - renamed from getTilesByProperty. This returns returns the Tiled metadata for a tile by property.

• TiledResource.getTilesByGid - get the Excalibur Tile instances and any Tiled metadata for a matching tile by global id

• TiledResource.getTilesByClassName - get the Excalibur Tile instances and any Tiled metadata for a mathcing tile by classname

• TiledResource.getTilesByProperty - get the Excalibur Tile instances and and any Tile metadata for a matching property.

• Entity factories can now be defined after load, but before adding to the scene!

This PR adds

• The ability to run entity factories after load
• Getting all Excalibur Tile instances that match a gid
• Getting all Excalibur Tile instances that match a class name
• Getting all Excalibur Tile instances that match a property