Validate acm pointer
Music and sounds for main menu
Emit fadedone event
Fades and music fix
Wire up sounds to buttons in GameMenuState.
Wire up sounds to buttons in PlayerPanelState.
Merge pull request #190 from isage/master

Proper game shutdown
Merge pull request #191 from rohit-n/menu-sounds

Sounds for different states.
Merge pull request #187 from isage/mainmenu

Mainmenu fades, music and sfx