macosx: Main menu improvements and fixes

Fixes bugs with the enablement state of certain menu items and unifies/simplifies the code around this by focusing on the use ad implementation of NSUserInterfaceValidation protocol

Signed-off-by: Claudio Cambra developer@claudiocambra.com

changed milestone to %4.0

added Component::Interface: macOS Platform::macOS labels

assigned to @claucambra

added MRStatus::Reviewable label

added MRStatus::Accepted label and removed MRStatus::Reviewable label

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added MRStatus::InReview label and removed MRStatus::Accepted label

resolved all threads

added MRStatus::Acceptable label and removed MRStatus::InReview label

added MRStatus::Accepted label and removed MRStatus::Acceptable label

MR Acceptance result

This MergeRequest has been Accepted! Congratulations.

MR acceptance checks details:

• MR should be considered mergeable by Gitlab
• Last pipeline should be successful
• MergeRequest should have at least one external review and/or vote
• All threads should be resolved, and score >= 0
• MergeRequest should have no activity (threads/votes) for (24h/24h)

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added 354 commits

• e2433ff0...3221c89f - 317 commits from branch videolan:master
• 3221c89f...03e19384 - 27 earlier commits
• ce40079d - macosx: Handle visual and channels menu items in validation
• 8b24f132 - macosx: Handle video related item enablement in validate method
• 0e249f6e - macosx: Defer further playback and video and audio menu items enablement to validation
• 3e0ca04a - macosx: Handle vout audio, video, and subtitle tracks enablement in validation
• 1ebfe5d1 - macosx: Clean up track handling in main menu
• ceb4ce96 - macosx: Manually update custom subtitle menu item elements
• caa677c9 - macosx: Remove listening to certain notifications with non-existent selector handlers in mainmenu
• 9dd5c33d - macosx: Update rate controls on capabilities change
• e8d7961d - macosx: Move subtitle entries update handling into track handling menus
• be336c08 - macosx: Handle video-related entries together in validation

Compare with previous version

enabled an automatic merge when all merge checks for be336c08 pass

merged