Added support for Tiled animated tiles

[CJRii]

This will allow the running of animations from Tile Layers. The SpriteBatch extension methods have been modified to now accept an optional parameter of a GameTime instance. If one is not provided, the animations will only show the first tile of the animation. The core of the change is that now all TiledTile objects will potentially have a reference to a TiledTileSetTile which contains all the information about the animation. This also has the side-effect of being able to access the Additional Properties of the tileset tiles.
Things that will need to be updated in the future:

• When the support to display Object Layers is implemented, animations will have to implemented there as well
• When layers are refactored to be more memory friendly as discussed in issue [Tiled] Rendering large maps uses a lot of memory #136 the animation code will more than likely need updating as well.

The TiledMaps Demo has been updated to utilize the new functionality.

[craftworkgames]

I did a quick code review and it looks good.

Did you update the demo to include animated tiles?

I'll take a closer look later.

[CJRii]

I did update the TiledMaps demo application. I should also note, this is a breaking change in that the Tiled assets from older apps will have to run through the pipeline tool again to insert the new fields the reader is expecting.

[lithiumtoast]

@CJRii I think this line

_uniqueTileSetTiles = _animatedTiles.Select(t => t.TileSetTile).Distinct().ToList();

is going to cause extra garbage to be generated since it's called every time map is drawn (60 times per second for 60 FPS).

[CJRii]

@lithiumtoast That line is inside the if block starting at line 67:

if (_renderTarget == null)

so it is going to only run once per layer because _renderTarget will be set in that same block.

[lithiumtoast]

@CJRii Ah you are right. Should looked at the whole file not just the diff.

[craftworkgames]

Wonderful work mate. Merged 😄

[zoalasaurusrawr]

Is there any way to get this change as part of a nuget package? Sorry for the necro but I'm in a position where I can't build from source atm.

Sorry for the necro.

EDIT: Found the pre-release nuget feed, sorry for raising an old thread. Solved!