Update - Warriors, Rogues and Wizards

A big update for the game to improve overall gaming experience.

New features:
- Attack animations to make clear who is battling who
- Gold amount animation when buying in the victory menu
- Button pressing highlight for a clear input feedback
- Sound system for button pressings and for overall gaming progress
- Extra gold reward when having only 1, 2 or 3 green flags remaining
- Bug fixes