more functionality for egps in 3d space

[Heatwu]

add a function for egp 3d trackers to scale based on distance to each respective client connected to the hud, similar to a sprite.
and potentially drawing 3d polygons as well

example functions:
Egp:egp3dTrackerScaleMode(Num[the index of the tracker],Num[0 or 1 to set the scale mode])
Egp:egp3dPoly(Num[the index of the tracker],vec1,vec2,vec3)