Added more classes, fixed Audio Thread issue

-Made Audio attach a LineListener to each Clip played and close it when it stops
--Kills a Thread when it's finished
-Moved PAX Website checking code to Paxsite.java
--Code organization!
--Made method getCurrentButtonLink() to remove repetitive calls to parseHRef(getCurrentButtonLinkLine())
-Moved Showclix checking code to Showclix.java
--Code organization!
-Fixed classes with references to Browser.java's Showclix and PAX Website code checking
-Fixed issue with Command-Line Interface opening the wrong link and sending the wrong link when Showclix link is found
-Changed version to 1.7.4.1