Barebones Event Manager implementation

This change also fixes a linting issue with logging in server/

interface.

Proof of Concept for dockerising the server component including work
to integrate with kubernetes, gitlab and docker hub.

This reverts commit 80339483f0.

while running

This reverts commit bacf733f52.

This reverts commit 73f8c98403.

protocol drop 'groupMessages' field
peer/sever fetch channel reworked to send series of groupMessage rather than groupMessages blob in order to not blow up a ricochet packet
minor doc fixes
change a few fmt to log
fix class variable name (cplc -> cpsc) in cwtchpeer listen channel
PeerPeerConnection.Close close Conn rather than break to catch goroutine leak

- run own server; delete pk from repo
- tests check and use test server if available (faster)
- alice & bob users
- chat
- pretty print results
- verify messages and content
TODO: disconnect and reconnect to confirm offline delivery
- server: autogenerate private key