Add possibility to extend regex functionality

[negoziator]

Simplification

1. Initialize default regexes
2. Loop over default regexes and remove all ifstatements

Extendability

1. Add a function to add your own regex that matches other functions than the default ones.

example:

$extractor->addPattern('/mytranslatefunction\((["\'])(.*?)\1\)/', 2, 'mytranslatefunction');

This will now also make the RegexExtractor match translate functions called mytranslatefunction(...)