Runtime assembly redirect

Currently, it is problematic to use multiple Cake addins using different versions of the same assembly (most frequently Newtonsoft.Json). Would it make sense to use `AppDomain.CurrentDomain.AssemblyResolve` (in full .Net Framework at least, not sure if there is anything similar in .Net Core) event in this case to redirect to the latest version if there are multiple?

I can try to prepare a PR, I just wonder if this functionality is desirable.

Start by reviewing how Cake loads addins and dependencies, then assess whether AppDomain.CurrentDomain.AssemblyResolve applies to full .NET Framework and whether .NET Core has an equivalent. The issue does not name files or tests; done would require a decided, tested approach for resolving conflicting assembly versions.

Written by the indexing model from the issue text.