Windows: Omnisharp plugin requires administrator permissions to download

[bryphe]

Issue:

In distribution builds, on Windows, the Omnisharp (C#) language service requires administrator privilege to download the windows client. The install location on my machine, for example, is here:
"Downloading C:\Program Files (x86)\Oni\resources\app\node_modules\omnisharp-client\omnisharp-win-x64-net46\omnisharp-win-x64-net46.zip"}

Therefore, downloading this in a non-administrator context will result in the download failing.

Potential Fixes:

• OPTION 1: See if there is a way to override the download / binary location for this. Potentially in the cache / userData folder of electron, or some of other writable place.
• OPTION 2: Copy the default or select plugins to the cache / userData folder on startup.
• OPTION 3: Package the downloaded file during windows install. This means the installation size is even larger, which would not be ideal.