~brandontschaefer/unity/possible-crash--fixes

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WindowButtons: disable the close button if the controlled window is not closable

Added support to WindowManager to get if a window is closable and maximizable, then used the IsWindowClosable method to enable or disable the close window button.. Fixes: https://bugs.launchpad.net/bugs/981196. Approved by Thomi Richards, Brandon Schaefer.

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