F12 removes xeno UI

[ExGame]

Summary (a quick, 2-3 sentence summary): Make F12 remove the bar at the bottom of the screen.

Benefits (How this will benefit the server and game as a whole): Spitters and carriers and other ranged xenos can actually see or click where they want to aim, even worse since they always attack from the north and have to attack the marines that are in the south (bottom of screen).

Details (Description of how you think this would work, the benefits, etc):

Implementation (Optional, if you have an idea how to implement it):