WikimediaUI theme: Add additional 'interactions' & 'media' pack icons

Adding additional icons from refined WikimediaUI collection:

• 'checkAll' to 'interactions' pack,
• 'exitFullscreen',
• 'imageBroken' and
• 'pause' to 'media' pack

Bug: T177432
Depends-on: I35fee09dbeb4ac5da7de859c15a1506b5fa5ac6d
Change-Id: Ib1a3f01fab3437a15e080262ad99ff75a718fa73