[Gtkradiant] [Bug 1014] New: Added light aabb's for doom3 lights

[gtkradiant@zerowing.idsoftware.com]

http://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=1014

           Summary: Added light aabb's for doom3 lights
           Product: GtkRadiant
           Version: 1.5
          Platform: All
        OS/Version: other
            Status: NEW
          Severity: normal
          Priority: P2
         Component: editor
        AssignedTo: ttimo@idsoftware.com
        ReportedBy: amahajan@chronos-central.com


This patch adds bounding boxes centered around lights and with extents 
dependent on the light_radius key.  It also draws a box designating the 
position of the light_center key.  Both of these features are only drawn when 
the light is selected.