Tileset not embedded in map by default.

[Parakleta]

Feel free to close this issue, I'm really just posting in case other people get caught by the same error and are looking for a solution.

I was getting the error "STI does not support Tile Collections. You need to create a Texture Atlas." when trying to load a map. I discovered that the tilesets table was not populated with all of the required data by default (as of Tiled 1.5), but rather expects the '.tsx' file to be loaded containing that information.

To work around this it is required that the "Embed Tilesets" option in the preferences is set before exporting the map.