* Introduced Parser::killMarkers() based on the concept from StringFunctions. Used it in cases where markerStripCallback() doesn't make sense semantically, namely grammar, padleft, padright and anchorencode. Used markerStripCallback() in other cases.
* Changed headline unstrip order as suggested by P.Copp on bug 18295
* In CPF::lc() and CPF::uc(), removed the is_callable(). This was a temporary testing hack committed by me in r30109, which allowed me to do differential testing against a copy of the parser from before that revision.
markers.
Not sure the preg_match() is actually needed. Or it may be
appropriate to use MARKER_SUFFIX for the match.
The error message may also need to be rewritten to be more
user-friendly, but I'm pretty sure *an* error message is friendlier
than UNIQ garbage. And making them visible error messages makes them
easier to be found.
* It was not necessary to preserve the $stripState->general->setPair() interface since it wasn't used by any extensions.
* Moved StripState to its own file.
* Refactored serialiseHalfParsedText() and unserialiseHalfParsedText() so that the bulk of the functionality is in the relevant modules, instead of using scary direct access to object member variables. Made it support the new StripState. It seemed like a lot of work to go to to support an "emergency optimisation" feature in Cite. Cite updates will be in a subsequent commit.
* Fixed spelling of serialiseHalfParsedText() and unserialiseHalfParsedText(), there is unavoidable interface breakage anyway, due to cache object versioning.
* Moved transparent tags to their own function, as requested in a fixme comment.
* Added documentation for markerSkipCallback().
* Removed OnlyIncludeReplacer, unused since MW 1.12.
