Time For Battle V0.3 - Hard AI and UI redesign

The changes in this version are:

• Redesigned game UI: hopefully now it is clear what is going on
• New Hard AI
• Pause menu
• 3D background of the battlefield. Still no animations there
• Some small bug fixes

And what's is planned for future versions:

• Tutorial and game tips
• Background animations
• Expert AI
• 2 players and AI vs AI games
• Different themed decks