Cleaned up static analysis finds.

-Removed unecessary instanceof check for HelpNode
-Removed unecessary int casts.
-Removed code comparing String to JMenuItem
-Added type to Dropdown
-Removed extra semi colon.
-Changed mod check to be safe for odd numbers.(Note: mod is actually remainder and can return odd numbers.)
-Removed static qualifier from obvious instance fields and removed unecessary lazy init of MapManager.(Its still lazy on class load.)