Version 2.1.0

• Added Router<A, K>, just like in the TypeScript and C++ versions. It is for lowing the noise in the network when doing lots of filters on the same stream.
• Added SodiumCtx::post for end user usage. Before it was only available internally.
• Added missing Stream::split
• Added drop based Transactions just like in the C++ version. (Use SodiumCtx::new_transaction to create a drop-based transaction.)
• Added missing snapshot3, snapshot4, snapshot5.