With no-one having invested into porting/maintaining any of those plugins,
the disadvantages of keeping that code in the development branches
(translators getting data of dead code, developers searching for usage
examples hitting lots of dead code, all the unported plugins/lost work making sad)
are not worth it.
Still looking myself right now to get the "mediawiki" runner working again, so
excluded from that list for now, but would remove if I fail.
(yes, only listing CMakeLists.txt in the review, for simple overview, actual files will be also removed)
Would execute the removal on Feb 15th, to give 2 weeks for everyone to consider
adopting one of those finally :)