fix lose user interaction when app make ephemeral window. #29
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Hi @NSExceptional
Capturing (strong reference) UIWindow is sometimes make a problem for example lose user interaction and eternal showing network loading progress window (PayPay.app; It is mentioned at #13 (comment) by me).
This PR fix that issue by UIWindow deallocation timing control back to application using weak reference to window.
Maybe address the #13 issue.