Add help button in main menu (opens Hedgewars Wiki in browser)
Might be replaced with an offline help in later versions (see
bug #660).
Lua scripts for engine testing. These scripts are the same as other Lua scripts
in Hedgewars, but you ought to call `EndLuaTest(TEST_SUCCESSFUL)` or
`EndLuaTest(TEST_FAILED)` when the test is completed.