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Fix three DVD video-attribute bugs surfaced by a PAL disc detected as NTSC: - PAL/NTSC: parse video_format from VTS_V_ATR bits 5-4, not bits 1-0 (the old mask read permitted_df, so PAL 576i/25fps was mis-detected as NTSC 480i/29.97). Named consts replace the magic bit positions. - Anamorphic aspect: write MKV DisplayWidth/Height from the disc's display_aspect (16:9 720x576 -> 1024x576) instead of square pixels, so 16:9 DVDs no longer render as 4:3. - Colour: stamp SD colorimetry (PAL=BT.470BG, NTSC=SMPTE-170M) instead of BT.709 (HD). Adds VideoStream.display_aspect (threaded through every muxer) plus TvSystem/DvdAspect/ColorSpace plumbing, with regression tests. Removes the deprecated Disc mux set_halt bridge (use with_halt).