Add RemoveOrNone to Dictionary extensions

[FreeApophis]

The Remove is an Extension on the IDictionary interface and has an out-parameter returning the removed Item.

Even though it has a side effect it maps perfectly to the Try* Pattern.

[FreeApophis]

I do not understand why PublicAPI check fails. The Signature was autogenerated and it looks the same as for GetValueOrNone.

[tautropfli]

The failing check is the package validation check from the .NET SDK, not the PublicApi analyzer :)

You can run dotnet build /p:ApiCompatGenerateSuppressionFile=true to update the suppressions, I think we've added notnull constraints before in cases where the BCL does so.

[FreeApophis]

The dotnet build with the paramter alone did not work, but I got it to update the suppression file (it was either that i tried pack, or the addition of the value to the csproj file).

We already had 3 suppressions, two of them are also because of the SDK change in Dictionary.