TYRUS-369: Format localized messages when necessary
TYRUS-368: Instantiate default encoders and decoders once per endpoint
TYRUS-370: Masking key is generated on server side
ParallelBroadcastTest fixed by limiting the maximal number of threads a client can create
	+ part of the documentation discussing thread pool configuration enhanced
Apidoc generation changed, so that it will reference websocket API apidoc published on java.net
TYRUS-367: Provide a way how to get low-level info about the session