Feature detection for MV load: add SVG, remove Object.create

OOJS polyfills Object.create now so there is no need to check for its
existence before loading OOJS-dependent code. On the other hand,
MediaViewer uses SVG icons extensively and the interface cannot be used
if they don't show up.

Bug: 70553
Change-Id: I716e12d4061cfc5c64ccca4563bc30a4394494af
Mingle: https://wikimedia.mingle.thoughtworks.com/projects/multimedia/cards/863
Merge "Feature detection for MV load: add SVG, remove Object.create"