Allowing application to force the asset system to recheck if an
asset has been "fixed" and can be used again
API:
+ ges_asset_needs_reload
Differential Revision: https://phabricator.freedesktop.org/D584
+ Generate the documentation
Note: Do not compile (add to Makefile.am) for now as we are missing pieces at that point
Co-Authored-By: Thibault Saunier <thibault.saunier@collabora.com>