CORE-5415: Removed old layout classes and simplified IplantWindowBase
Many of the construction parameters were always true or always false.
So, those parameters have been removed (isMinimizable, hasStatus,
isClosable).
CORE-5415: Class cleanup
CORE-5415: Simplified Iplant Window interface
CORE-5415: Removed unnecessary event
CORE-5415: Updating taskbar toggle logic