Messaging via external services

[Phoscur]

Classic OGame has a system messaging system that also allow player communication, but this comes from a pre-instant-messenger-age.
I think reading system messages should be easier and not require clicks.
Inter-player-communication privacy should be handled by external services and alliances should be able to choose which service they want to use for their group chat.

They key lies in integrating well with for example Discord to push out moderational requirements for group chatting