fix footstep 3d/2d sound
Merge branch 'master' of https://github.com/crentagon/GGJ2014Senses
Merge branch 'master' of https://github.com/crentagon/GGJ2014Senses
adjust ambience volume to 0.5f
Merge branch 'master' of https://github.com/crentagon/GGJ2014Senses