Reacting to CLR package versioning changes
Removing version token from framework assemblies node
Add Base64UrlEncode / Base64UrlDecode.
Move UseMiddleware from RequestContainer to Http.Extensions.
Update Claims dependency.
Change GetService calls to GetRequiredService

GetRequiredService throws for missing services like GetService used to.
Support removing features from FeatureCollection.
Add Session feature, object model, etc..