Update 1: Ai Mode & Zeta Hero

This is the biggest update so far! I've added a fully functional AI for players to go against. Currently the AI picks a random character. Its capable of playing any of the characters, some better than others. 

I've also added a third character called Zeta Hero. He is focused primarily on melee attacks. 

Other updates include:

• Nerfed Guard - Now needs to recover to full for maximum protection
• Zeta Fighter now has a ranged attack. Other parts of his kit have been nerfed to compensate. 
• Random option now works for the character select screen.
• Cyber Miami has its own BG.