Removes Every Colon operator from Gamemode code. ALL OF THEM.

- I have Removed every instance of Colon Operators in the Game mode code.
- I have added gamemodehelpers.dm containing "game_is_EXAMPLE_mode(var/ticker_mode)" procs
- I have removed *some* ancient commented out code, it will never return so, Bye bye for good.

Bow before me code peasants. Nah but seriously guys don't use colons.