Ignore message-type chat commands (/hsa, /clan, etc.) w/ empty arg list

Rename chat command /team to /clan (but keep /team as alias for now)

Teach engine to properly display clan message received from the net This fixes a bug that the word “Clan” was not translated when you received a clan message from the net.

gameServer: Handle empty chat command (partially)

gameServer: Always report command name if getting an incorrect command

gameServer: remove duplicate VOTE/FORCE command handling

Display error when entering invalid chat command in offline game

Make frontend forward server error and warning messages to engine

Pas2C: Add preprocess files to .hgignore

Rewrite StrToInt code in uStore; get rid of "try" and "except" keywords

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