Added proxy support

[uxkjaer]

Thank you for your contribution! 🙌

To get it merged faster, kindly review the checklist below:

Pull Request Checklist

• [X ] Reviewed the Contributing Guidelines
  • Especially the How to Contribute section
• [X ] No merge commits
• [X ] Correct commit message style

[uxkjaer]

I accidently did my initial commit with an old user from my laptop instead of my github user. I don't have access to that email anymore as it was with my old company. I can't sign the CLA unfortunately with that Jakob Kjaer user. I hope you will still consider my contribution.
Huge credit should go to Petr Plenkov as he has done most of the work already, I simply adedd the concepts into the UI5 server and added authentication

[RandomByte]

Related to SAP/ui5-tooling#41

[RandomByte]

Hi @kovboyjder, thank you for your contribution!

We will first have to check whether this matches with the proxy concepts outlined in RFC 0003. It would be nice to have a reuse of neo-app.json configurations though.

Regarding your Pull Request: You checked all links in the PR description but I suppose there was some kind of misunderstanding. Please have another look into our Contributing Guidelines and ensure that your commits fulfill our Development Conventions and Guidelines.

I would also prefer it if you could squash all commits into a single one. If possible, the tests should also continue to work offline, i.e. without internet connection.

[RandomByte]

Please remove this thirdparty URL