News: 3D sound implementation in Celestia is on the way

[pirogronian]

As in the title, 3D sound implementation in Celestia is on the way. It uses OpenAL & ALUT.
What should be implemented in first Pull Request:

* Playing from small PCM fiels (*.vaw).
* Playing dynamically generated tone.
* Looping playback.
* Use as sound source any selectable Celestia object.
* Setting volume, gain etc per source.
* LUA interface for everything listed above.

What should be implemented later:

* Playing from larger fiels (streaming).
* Playing various audio formats (using libsox or even ffmpeg).

What can be broken after first pull request:

* Missing OpenAl & ALUT headers & libraries on various platforms...

[DaveBowman2001]

Nice!