Added sound.h, sound.cpp
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Added GameEventObject, and a bit of fleshing out of GameDoor
Added basic GameSwitch class (with no functionality yet)
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame
Merge branch 'master' of https://github.com/austinhulse/SpaceGame