* Add Counter for world updates per Second
This work was just done for personal testing and is probably not up to the
required code standards. Nonetheless, I have decided to send a PR as it is very
useful information and a good starting point.
* add MarkWorldUpdate method
Center message takes up too much space on smaller screens (e.g. mine is
800x600), especially on killstreaks or intense CTF servers. So, you can
either disable all center messages ("0"), enable all default ones ("1")
or disable your kill center messages("2").
To make killfeed easier to read it is advised to make local kill icons
be black (stands out the most).
