[3.0 backport] doc/libvlc: add appkit_player demo code

The sample code demonstrate how to bind an NSView to a media player to integrate video playback in a Cocoa application.

Cherry-picked from 60fcef78.

The sample is interesting to have in the 3.0 tree to test things like !4974 (merged) directly.

changed milestone to %3.0.x maintenance

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added 9 commits

• ee55bf8b...c6883f93 - 8 commits from branch videolan:3.0.x
• 7a3acd41 - doc/libvlc: add appkit_player demo code

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merged

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