* The alternate theme is just useful for testing themes, but please comment on the changes to the main theme.
* Options reading and initializing separated from UI.
* Options UI abstracted a bit, made more easily extensible.
* With some extension, the options UI could be used as the basis for more complicated themes, if we load a file and use it to do stuff like GameStateOptions::Start()
- It is now possible to have avatars associated to each Deck
- Added SFX
- Added Music files
- Possibility to choose your opponent
- Opponents' difficulty is measured according to their number of victories against a given deck