Updated mediawiki/extensions
Project: mediawiki/extensions/Flow  534e9455ea38b2c164f93bce51eb0e9501e85edd

Hygiene: Subdir ContentFixer implementations

Much like the Extractor implementations lets subdir these
to keep it separate.  Additionally the name Controller doesn't
really describe what the class does, the best name seems to be
ContentFixer.  As ContentFixer is already taken by the interface
lets rename the interface to just Fixer.

Change-Id: I350814ff0a532106fbd3d0d506fc685bbee8f0bf