v0.21.1312

• New: Added Identity<>.NewComb() that creates sequential unique IDs which can
  be used to minimize database fragmentation
• New: Added IReadModelContext.Resolver to allow read models to fetch
  additional resources when events are applied
• New: The PrettyPrint() type extension method, mostly used for verbose
  logging, now prints even prettier type names, e.g.
  KeyValuePair<Boolean,Int64> instead of merely KeyValuePair'2, making log
  messages slightly more readable