Info.plist: add missing file extensions

This adds almost all of the file extensions supported by VLC and there-by closes #802 (closed).

Additionally, this changes the logic for the file extensions that we expose from "Exported" to "Imported" as in fact we did not invent any of those formats but support them.

changed milestone to %3.5.0

added Maintenance label

approved this merge request

added 7 commits

• 97b36ac9...2da7db44 - 5 commits from branch videolan:master
• 8766231b - Info.plist: define imported instead of exported type declarations
• b1fe638a - Info.plist: add mission file extensions

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enabled an automatic merge when the pipeline for b1fe638a succeeds

merged