Proxy start fails on UWP

[nirdil]

Under UWP, running ProxyServer.Start throws a System.IO.FileLoadException for Microsoft.Win32.Registry. Was mapped to the following code:

// clear any system proxy settings which is pointing to our own endpoint (causing a cycle)
// due to ungracious proxy shutdown before or something else
if (systemProxySettingsManager != null && RunTime.IsWindows)
{
    var proxyInfo = systemProxySettingsManager.GetProxyInfoFromRegistry();

As a system proxy is irrelevant for UWP anyways, I suggest to just wrap this cleanup with a try catch, that worked for me and allowed it to run on UWP.

[justcoding121]

Should be fixed in latest beta.