XRENDERING-324: ConfluenceXHTMLParser does not repair CDATA containing square brackets

 * "repair" the CDATA sections the moment they come put of the entities.xml
 * add testcase - disabled yet as this needs one more fix with the attachments
XWIKI-9803 (was XRENDERING-324): confluence CDATA repair stuff

 * use precompiled pattern for repair
 * rename test data to updated issue name
Merge pull request #245 from ClemensRobbenhaar/XRENDERING-324

XRENDERING-324: ConfluenceXHTMLParser does not repair CDATA ...