add to the list of Features F# doesn't support



add interop type embedding
Universal Windows Platform - https://msdn.microsoft.com/en-us/magazine/mt590967.aspx
`#pragma warning disable`
`#pragma warning restore`
`protected` methods
`partial` classes and methods

already added:

- `nameof`
- covariance/contravariance
- Nested classes
- implicit interface implementations
- reflection to get at a module