Handling of MODE7 colour blending about bbcmicrobot HOT 4 CLOSED

The new beebjit option -opt video:no-deinterlace-teletext helps - I still get a video rather than an image, but it looks much better.

Most of the video has the interlaced colours, but there's a brief flicker as it repeats. Looking at the raw bgra frames from beebjit, it's the first two frames - we get a frame with just one interlace, then a frame with just the other interlace, then the rest of the frames have both interlaces combined.

The same effect can be obtained just by looking at the start screen - patch the bot to pass the new option and then:

echo 'V.279;0;0;0;0;'|node client try

I'll open an issue with beebjit.

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Looks this is now good enough / remaining issue is with beebjit so I'll close this

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We don't yet actually use video:no-deinterlace-teletext (I just patched it locally for testing) but I'll sort that out.

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And FYI, scarybeasts/beebjit#24

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