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 gamemode_helpers.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.

<b>For a Reviewer:</b>
For whomever wishes to review this, Considering the importance of the code that was changed here, I was extremely careful to maintain the original functionality of it all, but with nicer code (And no DAMN COLONS) so you'll need to trust me, or get a second opinion from another Coder.