Fully cross-platform apr build system.
Fixed BGMPlayerSeek compile error
Merged upstream
Improved sound engine and playlist class.
-#.wav files are for quickly testing the playlist
Added manual and automatic Sound loading mechanism.
All sounds are now used by their asset-path.
Removed unused debug define
Removed test sounds
Modified Sound to use Resource instead of Asset
Added define to enable or disable SoundService log messages
Fixed wrong include (Asset.hpp was used instead of Resource.hpp)
Fixed sticky "action" in GUIMenu
Merge pull request #4 from mike96/master

Merge day