Use system Proxy settings

[fesgic]

Checklist

• [x] I'm reporting a feature request
• [x] I've verified that I'm running xdm latest version
• [x] I've searched the bugtracker for similar feature requests including closed ones

Description

• Requesting additional features to use system proxy to settings

WRITE DESCRIPTION HERE

• Often when using a proxy on pc, xdm catches the download but doesn't download unless you input the proxy settings in xdm
• Requesting an additional feature on top of the one available to allow an extra option in xdm to use system proxy settings to reduce user workload on changing proxy each and every time they use a new proxy

[xiaoyulei]

I vote this features, it is really not convenient on proxy setting.