Quick and important update before the Steam release.

An update to make things more fun! Edited the map to make it smaller. Heroes will now be able to get into the fight faster, or quickly take or defend points.

Also everyone's HP is reduced. This will make the gameplay much faster. Especially when fighting the AI computer.

Updated the main menu and made some important in-game and multiplayer bugfixing too.

Some balance changes (mostly improved heroes' AoE abilities):
- increased aoe of ifreet's explosion and ragnaros' fury
- increased amy's multishot dam
- increased ifreet's explosion damage
- reduced ifreet's spiral MC to 25
- increased wind slash and spear toss damage (a little)
- improved masamune's azure dragon required HP to 50%
- reduced alicia's parasol musket stack to 3