TP: marshaller pool to marshall messages

Regular and bundled messages use a single output stream to marshal messages. This resource is locked and unlocked when done.

Ass a MarshallerPool class which is configured with a pool size and initial size, and then randomly grab a marshaller from the pool to unmarshal and - when done- return it to the pool.

Through this lock and resource striping, apps with many concurrent threads sending messages should be faster