Kicked out while doing my turn

[piranha]

My session expired while doing my turn today so when clicking end turn nothing happened. When looking in the debug it turned out that there was out of sync (my movement didn't register with the server) and when I reloaded the page I was not logged in anymore.

After logging on again about 75% of my movement was reverted back.

So we need to make sure session / cookie does not expire while doing a turn, and if it does we should probably popup a window telling the player that they need to login again.