Fixed the multiple window closing issue, where the two multiwindow examples weren't working. #3499
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This was due to the tao window instance not being dropped. Furthermore the whole desktop context should have been dropped but wasn't due to the Rc that had 3 strong references too many because of copying in webview::new. I replaced everything with weak pointers so that the desktop context has 1 strong reference to the app, so that it is dropped when it is removed from the app.webviews hashmap.