extended Kwc/Basic/Text/Component for more extensible support

outsourced getContentParts in protected function _getContentParts, to easily override this in web
e.g. for an own parser
added param $ignoreLinksWithClass for Kwc/Basic/Text/Row getContentsParts function

if you want to add own links, and these should not be marked as invalid, set the ignoreLinksWithClass as param and as class in the link and these would be ignored
added _checkIgnoreLinksWithClass function in Kwc/Basic/Text/Row

these function checks the links with the $ignoreLinksWithClass param, if true these would be ignored, false these are invalid
added some tests for the new $ignoreLinksWithClass param in Kwc/Basic/Text/Row
Merge pull request #44 from kaufmo/3.3-getContentParts-with-ignored-links

param $ignoreLinksWithClass for getContentParts in Kwc/Basic/Text/Component