feat: Allow prop_testchamber_door to have it's model and skin chang…

…able

fgd/point/prop/prop_testchamber_door.fgd

@@ -1,8 +1,6 @@
 @PointClass base(BaseEntityAnimating)
 	appliesto(P2CE)
-	// Non-animating model, which prevents it continually opening 
-	// and fixes collision display.
-	studioprop("models/editor/prop_testchamber_door.mdl") 
+	studioprop() 
 	line(255 255 0, targetname, areaPortalWindow) 
 	line(255 255 0, targetname, lightingorigin) 
 	sphere(AreaPortalFadeStart) 
@@ -17,6 +15,9 @@
 	open(boolean) : "Start Open" : 0 : "If set, the door starts in the open state."
 	locked(boolean) : "Start Locked" : 0 : "If set, the door starts locked and can no longer change open or closed state."
 
+	skin(integer) : "Skin" : 0 : "Skin to use in game"
+	model(studio) : "Model" : "models/props/portal_door_combined.mdl" : "Model to use in-game"
+
 	// Inputs
 	input Open(void) : "Open the door and cause the areaportal to return to fading."
 	input Close(void) : "Close the door and cause the areaportal to close."