Store the bundled "vanilla" themes in the themes.xml file or not?

[boformer]

If we store the bundled themes in the xml configuration, players can modify the themes to add custom assets.

The problem is that updating the list will be harder when a game update that contains new assets is released.

[bloodypenguin]

Bundled assets names can be retrieved from their respective collections GameObjects like, say, 'European Collections/Europe Commercial Low`. Only GameObjects' names will need to be updated If assets are retrieved in such manner.

[boformer]

That's a nice idea.

[bloodypenguin]

Anyway, we don't need to store 'vanilla' themes in themes xml file

[bloodypenguin]

Implemented merging of loaded and built-in themes