Remove Extension:NativeSvgHandler

Christian Heuselrequested to merge
github/fork/nl6720/rm-NativeSvgHandler into master

Created by: nl6720

MediaWiki 1.41 supports SVG rendering natively (though it is still off by default), so there is no need for Extension:NativeSvgHandler anymore.

See https://www.mediawiki.org/wiki/Manual:$wgSVGNativeRendering

Also update .gitmodules.

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