Trim support

[miguelmoraleda]

Hey @manuelodelain ,

Does the library have support for trim with Texture Packer?

[manuelodelain]

Not yet. It would be a good thing.

I guess a custom parser could parse the TexturePacker data file (likes the JSONArrayParser) and initialize frames with properties spriteSourceSize and sourceSize.
Then the renderer applies the custom frame size before to render it.