This is a big change, but should change nothing except the sizes of some
files and where they all are.
There are no more ext.multimediaViewer strings ANYWHERE, so let's keep
it that way. :)
Change-Id: Ic0892f5894700938bfa01f3f9bc8e5ab8276eb72
Adds buttons on the side, disabled at the start and end of the list of
images, that let you browse through the images on the page!
Also arrow keys!
EXCITING!
Change-Id: Ie514cd4b16bdee8a384a89d4bd1d755a24c5cdb4