Allow loading application XPM icons
Allow loading application XPM icons

Ignoring XPM icons made sense as a way of ignoring unmaintained applications
before AppData files were mandatory. Now we have the latter we should load
valid application XPM icons if they are large enough for the builder tests.

Some package maintainers were just converting the icons at package build time
to just avoid the veto.

ximion/appstream-glib,hughsie/appstream-glib,ximion/appstream-glib,ximion/appstream-glib,hughsie/appstream-glib,hughsie/appstream-glib