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This is very first stage implementation of libraryView,here its using hardcoded images

This changes and new properties are as per Xcode specifications

The following files are newly introduced
- VLCMainWindowCollectionViewItem.xib : An Interface for showing collectionView items.
- VLCMainWindowCollectionViewItem.h   : Header file for defining instance and instance variables
- VLCMainWindowCollectionViewItem.m   : Cococa class which contains implementation of instance and representation of objects

macosx: add a basic collection view for future implementation while retaining the current main window behavior

This is part of first steps in making the Library view

This is part of first steps in making the Library view

This is part of first steps in making the Library view

This is part of first steps in making the Library view

This should be able to be just replace the old NSUInteger, according
to docs.

Access to those will be removed in a future update of macOS

Access to those will be removed in a future update of macOS

This simplifies the notation. No function differences.

(no functional change)

This works like config choices.

...where applicable.

Also remove unnecessary strdup/free pairs for descriptions.