Prevent changing JVM System proxy

[LukasWestholt]

Hello everyone!

I have the same problems like #182, but I can't reopen it. I am using the newest version.
In my opinion teardownProxy(); is not a solution. If it fails one time, you have set https.proxyHost forever.

There must be a more reasonable way to use requests with proxy in Java (also for plugin programming). I ask you to reconsider this.

[alanhamlett]

Yea, I also would like to avoid changing https.proxyHost if possible. I'll look for another way to do https requests that doesn't need changing the system proxy.

[LukasWestholt]

Thank you!

[alanhamlett]

Release v14.1.1 should improve this, since I found we didn't correctly reset the system proxy if one wasn't previously set.