Change the OOS notification logic to remember the OOS-ness of each
client. Reset it on client leave.
The server will thus continue checking for OOS if the OOS-client leaves.
This is convenient to ignore observer OOS, or wait for an OOS player
without restarting the game.
Also add the turn number to the OOS dump, to fix#3348: particularly
following d4c2cf4430 the turn is likely to not be the same between
different clients.
Agree by: asterix
Differential Revision: https://code.wildfiregames.com/D3753
This was SVN commit r25170.
wraitii
b55b236379