Multiplex server messages over tcp connection

[ajuvercr]

@wschella had an idea to keep the bot runner updated about lobby changes, like bot connects.

This can be done on MOZAICP level, HostMsg and something like ServerMsg. So client side you can filter on "host_msg" and "server_msg" but please better naming scheme.

@wschella also had an idea about a bot runner hash to indicate whether or not it is the latest version. Because the bot runner is a local file, this is very useful to inform the end user they have to update.

[ajuvercr]

To check the bot runner hash you can check with a simple http request, this does not have to be part of the game protocol.