Add .NET Core project support to Evolve

[lecaillon]

.NET Core projects have a completly different build folder arrangement.
Apart from the main assembly, all the others (database drivers in our case) are in the NuGet cache. So finding and loading them on the fly at build time is quite delicate. Even more when you need to deal with their native dependencies.

• Add new MsBuild task for .NET Core projects
• Add new assembly loading strategy for .NET Core db drivers