add initial timeout for parse timer and allow access through RSTA

I ran into a problem with not being able to set the parser delay of an RSTA on a previous version (2.0.x). Fixed it by delegating access to parserManager.delay property. Also, ParserManager did not initialize the initialDelay of the timer it uses, which in turn caused the timer to be ineffective, because handleDocumentEvent() invokes timer.restart(), which fires its first event after its initial delay. So there was no delay while editing, with reparsing occuring between every keystroke.