Re-enable support for two VisualEditor related groups

These two components are in non-MediaWiki extension repos. There were
patch sets that added two new projects, but I found that bloated. This
implementation is a hack, where I configure the two repos as if they are
MediaWiki extensions. No changes are needed in repocreate, repoexport and
repocommit.

Change-Id: Ia580491d9b329200d3def5425d887f0062e0a1a2