GStreamer Player

The aim of the player is to:
- be a good player of video files on GStreamer platforms
- be useful as a player for all media types supported by GStreamer

It's also used as a primary test bed for playback features of GStreamer.

It now has the following working features:
- Play/Pause and Stop
- Seek slider
- Volume slider and mute
- Fullscreen video mode
- %50, %100 & %200 video magnification
- Software video scaling
- Tag reporting
