v0.5-beta.1-OnPremise

First OnPremise version, which we hoped will never be needed but here we are

For the moment this NuGet relies on Microsoft.SharePoint2016.CSOM NuGet package that is more than two years old. Online and OnPremise version are getting different with each new update of the Online version and even though most of the code works with SharePoint Online CSOM library, there are cases, like loading users from SharePoint, that throws error on parsing data from SharePoint because it's missing certain properties.

This is an untested beta.