IFNDEF custom exception handlung away in pas2c builds

Resolve ambiguity of <> in Pas2C.hs

Add help button in main menu (opens Hedgewars Wiki in browser) Might be replaced with an offline help in later versions (see bug #660).

Fix frontend displayed value of Sudden Death timeout being off-by-one

ASA, desert02: Add achievement for escaping with all crates collected and no damage taken

ASA, ice02: Display current flying time next to team bar

ASA, ice02: Fix recorded time being 6 seconds more than reality

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

Move campaign mission images to share/ instead of hardcoding them into frontend Hardcoding campaign mission images prevented add-ons from adding their own preview images.