Adds support for downloading and installing the latest version of Rainway

[andrewmd5]

Hey there,

First, let me say thank you for putting this script together. I'm sure it will do wonders for those looking to spin up their gaming rigs on Azure.

I noticed you were installing a VPN on the system so you could use Steam In-Home Streaming. That seemed pretty inefficient from a latency standpoint, so I forked and added a function for downloading and installing the latest version of Rainway.

Rainway is a web-based game streaming platform that lets you play all your favorite PC games from Steam, Origin and other platforms anywhere.

I didn't see your security group policy, but here are the ports it uses so you can make sure they're allowed.

TCP 443 TCP 40136 UDP 22000–22010

[ecalder6]

Thanks for creating the PR! At this stage, I cannot merge this PR as it does not work with automated deployment. I'd be happy to merge it if we can get the following resolved:

• Silently install .Net and C++ dependencies.
• Install without admin. In both setup stages, no actual user is logged into the VM.

The ports can be configured in ARM template, though Rainway seems to work fine without any settings.

[andrewmd5]

I will circle back and have these done over the weekend.