Support multiple named animations per Tile

[Rialgar]

I would really like to have multiple (named) animations on one tile, this is especially useful for objects, since these might change their animation during the game. Some examples:

• Collectibles that make a little splosh when collected
• Enemies that can walk, stand, die, ...
• A Goal that shows a nice animation when reached It would be great to have all these animation specifications in a single place, and I think the Tiled file would be an excellent location.

For the time being I will probably create each animation on the starting tile and add the names as custom properties.