Remove unmaintained and buggy CVS plugin
The plugin causes hangs or crashes of KDevelop during some of the most common operations. We haven't received any external bug reports for this (nor from 5.0-beta1 to 5.2.1 when the plugin was entirely non-functional), so it appears that no-one has attempted to use this feature. Advertising this as a "feature" when it's unusable with no real prospect of being fixed will only hurt KDevelop's reputation if anyone does try to use it. Of course the code is in git history in case it's wanted in future.
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