Fixed paramedics not having the FR HUD icon anymore on the Security HUD.
Moved all the HUD icon files in the hud folder.
Changed the in_view() proc used for HUDs to use the more performant
get_hearers_in_LOS() / get_hearers_in_range() over view() and a list
traversal with range comparisons.
HUD now respects the client view size instead of just using the world
view size.