Includes a workaround for a type collision when using NUnit3's .Net 2.0
build on .Net 3.5, see nunit/nunit#1349 for details.
Leverage Paket file-dependencies for FsUnit instead of NuGet packages
since it makes sense and the FsUnit NuGet package no longer supports
.Net 3.5. Partially migrate to FsUnitTypes where possible.
Since every unit test file had to be touched anyway, also fixes file headers
where they were broken.
No longer commit packages folder (.gitignore). Use restore.cmd to restore.
For C# and also for all non-net35 F# targets we still use the proper NuGet package.
This allows us to use one FSharp.Core NuGet package only (instead of two
with platform-groups), resolving quite a few issues.
Christoph Ruegg