update embedded jQuery & jquery-ui to one that addresses known vulnerabilities #279
Description
We've had some reports from JalviewJS users about detectable vulnerabilities in the SwingJS runtime - see e.g. jalview/jalview-js#12
The core problem is jQuery v1.11.0. Whilst its possible we could patch the vulnerability (or it perhaps isn't even serious for SwingJS deployments), scanners will still see the version number and most likely complain.
I've had a go at porting the patches in swingjs2.js to the latest release of jQuery, this seemed to work OK - but I've now got issues with JQueryUI. Would be great to get some guidance @BobHanson !