QTGMC settings advices

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Settings are usually disabled if they depend on other options, for QTMC you need to select preset 'Custom' since you want to use settings not specified by a profile.
RemoveDirt in Vapoursynth got disabled since there is so no version for Vapoursynth that properly works.
(didn't knot that when I added the option, and I still hope that once upon a time someone implements a working version of it)

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