DVB: Simplify the statistics interfaces handling.

Simplify ada3ea6714e7c5f11e73df27aa7123c5a491e362 and cec98b16291eee027e726a9ff4a481f13ef59221.
Make "Sharpen Complex 2" shader compatible with Pixel Shader 2.0.
Add the ability to close a media instead of pausing/stopping at the EOF.