Renamed files, GUI updates, small changes

-Renamed: ErrorManagement.java -> ErrorHandler.java
-Renamed: KeyboardManagement.java -> KeyboardHandler.java
-Changed Browser.getCurrentButtonLinkLine() println notification of no button found text
-Added Thread name to background Thread for sending email
-Added Thread name to background Thread for loading patch notes
-Added Thread name to background Thread for loading icons in background
-Added Thread name to background Thread for sending test email
-Fixed typo in Instructions.html
-Changed version to 1.5.2
Made links in Status window clickable, small updates

-Made Showclix and Website links in Status GUI clickable
-Made "newLine" and "submitLine" methods in KeyboardHandler
--newLine presses Enter
--submitLine tabs, presses Enter, waits two seconds, then shift+tabs (mostly for Reddit Live)
-Changed version to 1.5.3