typefindfunctions: Extend MCC typefinder to also cover version 2.0

Merged Sebastian Dröge requested to merge slomo/gst-plugins-base:mcc-v2-typefind into master

Both versions are basically the same, but version 2.0 also allows 60000/1001 as framerate and allows to specify the field and line number for each payload.

Put the major version into the caps so that elements can limit via caps negotiation which versions they can support.

CC @alatiera

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