fixed crash on setPenColor
BitmapData.fromFile

- The logic to load a bitmap data has been moved here.
- Better ldoc comments
Review of getTexture and cache logic

- Assets works as entry point for all assets, without any logic. No
more caching
- TextureAtlas doesn’t cache generated textures anymore
- TextureManager can mount only one atlas per mount dir
- TextureManager is the only object with a texture caching logic
Extended Stats informations