Fixes and small changes

v1.4.0.37

• New 90s/turn timer in multiplayer - we see the most errors in 1 min/turn games (the fastest timer) so if you play these, consider if 90s/turn would work for you because it might be more stable.
• Updated server code to better manage timers in multiplayer games with lots of players.
• Fix for multiplayer games breaking if a player hard quit at the moment their timer expired.
• Improved latency calculations to reduce possibility of desyncs.
• New UI to explain when the server is shutting down for maintenance.
• Attempted fix for rare bug where UI becomes unresponsive upon starting a new game.
• The images in How To Play have been updated.
• All resource amounts on UI panels are now localised.
• Minor localisation issues on the loading screen have been fixed.
• Berbers (Sahara Desert) difficulty from Hard to Medium
• Tichitt (Sahara Desert) difficulty from Easy to Medium
• Aksum (Sahara Desert) difficulty from Easy to Medium