Gwent for mobile platforms

[supamu]

This is an attempt to bring the popular Gwent game from Witcher 3 to the mobile platforms, with focus on tablets and single player against AI.

What is done so far:
- the AI class has the basics already functional.
- currently the AI has its deck randomized based on the players deck strength, the stronger the player deck, the stronger the AI deck becomes.
- the visual representation of the cards is ongoing.

To do:
- finish the visual representation of the cards on the board
- implement Mulligan and/or Tutorials
- implement a Deck Builder interface
- troubleshooting and Beta testing.
- etc.