ogg audio playback

[SSE4]

there is a playogg library we don't have any sources for.
it's used to play ogg/vorbis music files.
we have to replace it with our own cross-platform implementation.
it could be based on open-source, free of charge solutions:

• ffmpeg
• gstreamer
• SDL_mixer
• plain usage of libogg and libvorbis

[stalkerg]

If you not needed FX like pitch the SDL2_Mixer will be the best.
Vangers was moved from Mixer to Clunk because we have some specific requirements.

Just libogg/voribs not enough because you need somehow make output.

[IonAgorria]

Small update, the sources for PlayOgg was found and is already part of builds (it uses libogg/libvorbis and dsound) so maybe issue title/desc can be changed?

In future it would be necessary to drop Windows/DirectX sound dependency and use a more portable alternative such as SDL2...