* Use protobuf packaging for the Any type
This pull request implements two converters which help with the type conversion between arbitrary types and the protobuf `Any` type. The C# protobuf library provides a mechanism to pack or unpack protobuf messages to `Any`. It provides the methods `Any.Pack` and `Any.Unpack` to serialize/deserialize messages based on `Google.Protobuf.IMessage`. For types that are not based on `Google.Protobuf.IMessage`, the existing JSON serialization/deserialization will be used.
I've also cleaned the existing codebase a little bit.
Fixes#268
* Fix suggested changes
Christian Kaps