Changing how updating works, small fixes

-Checker.java uses correct PAX website or Showclix website link when tickets are found (1.7.3 has the correct ones)
-Made JLInformation start out blank
-Made program load patch notes on main Thread before updates
--Will make program take longer to start up
-Made UpdateHandler rely on Patch Notes for update checking
--Does not compare file sizes any more
--BETA updates are now saved in a PAXCheckerBETA.jar file instead of the main PAXChecker.jar file
--updateLevel starts at -1, goes to 0 for current version
Small changes

-Removed license headers from Checker.java, DataTracker.java, Encryption.java, PatchNotes.java, Tickets.java, UpdateHandler.java
-Removed Tickets window class variable from Checker.java, made it local to showTicketsWindow
-Removed separate Thread loading patch notes from PatchNotes.java (useless Thread creation)
-Removed unused methods from PAXChecker.java
Fixed ErrorHandler unnecessarily killing program

-Made Showclix and PAX website link print out in Command-Line Interface mode
-Made program remove spaces in first part of email address
-Removed ErrorHandler's ability to kill program
-Updated version to 1.7.4