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Changed a lot of attr()s to prop()s, bind()/unbind()/click()/change()/blur()/hover()/focus() to on()/off() as jQuery migrate-plugin suggests so we are more prepared to upgrade jQuery. Also upgraded jQueryUI to the newer version from #453. There should be no functional changes.
The codebase should work with jQuery 3 with these changes, but also works with the current version.