[TYPO3-core] replaceString and other changes

[Martin Kutschker]

Hi!

I have changed the new := code. While implementing replaceString I noticed several issues.

* The original code has one preg_match and two preg_replaces (why?), where I think only one preg_match is needed.

* addString and removeString have their arguments trimmed. This deafets the whole purpose of the brackets. If I write addString( some string), I most likely want the space at the beginning. This was ever so dull in TS that you could not add spaces easily. So I have removed the trim(). *

* addString and friends are not operators but functions (+ is an operator, := is an operator as well). I made (superfluos) changes in the naming of the internal variables to reflect this.

Masi

* If the trim has to staty than i want argument quoting with ". 
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