No Sound on Linux => implement OpenAL Sound Backend

[Daniel Gibson]

Implement an audio.so with the daikatana sound backend interface using OpenAL, because we don't have miles sound system for Linux.

[Daniel Gibson]

Hrm is there no "in progress" state?

Whatever, I'm working on this.

[Daniel Gibson]

Implemented the OpenAL backend (for Linux, can be ported to other platforms later, should be easy) and merged it to master.