Add help button in main menu (opens Hedgewars Wiki in browser)
Might be replaced with an offline help in later versions (see
bug #660).
ASA, desert02: Add achievement for escaping with all crates collected and no damage taken
ASA: ice02: Render green rings as double rings
Visual aid for colorblind people
Set script globals TurnTimeLeft and ReadyTimeLeft immediately after they were changed by Lua call