Major changes added!

• Art credits added.
• 10 new cards added.
• sounds updated.
• graphic effect and animations updated.
• 8 opponents added.
• rewards updated.
• edit deck screen updated.
• options updated.
• AI modifier added to options.
• rewards modifiers added to options.
• Overkill rule added to options.
• screen shaking added to options.
• bug fixes and improvements.