Add nearz property to clustered lights

fgd/bases/BaseClusteredLight.fgd

@@ -16,6 +16,7 @@
 	_dynamicshadowallocation(boolean) : "Use dynamic shadow allocation" : 0 : "Determines whether the map (static) or the engine (dynamic) should dictate the size of the shadows for this light."
 	_initialshadowsize(integer) : "Initial Shadow Size" : 3 : "The initial static shadow resolution exponent. Only relevant for static shadow allocation. Adding 1 to this value doubles both dimensions of the shadowmap."
 	_shadowscale(float) : "Shadow Size Scale" : "1.0" : "Scales the shadowmap resolution exponent. Only relevant for dynamic shadow allocation. For example, a scale of 3.0 will give this light shadowmaps 8 (2^3) times as large as they would usually be."
-
+	nearz(float) : "Near Z" : 4.0 : "Near Z for this light. Determines where shadows start to be cast. Inside the nearz radius, the light is still visible, but anything inside it won't cast shadows"
+
 	input SetShadowSize(integer) : "Set the size exponent of this light's shadowmap(s)."
 	]

fgd/point/light/light_rt.fgd

@@ -1,5 +1,6 @@
 @PointClass base(BasePointLight, BaseLightFalloff, BaseClusteredDynLight)
 	clusteredlight(point)
+	sphere(nearz)
 = light_rt: "An invisible omnidirectional realtime light-source."
 	[
 	]

fgd/point/light/light_rt_spot.fgd

@@ -1,5 +1,6 @@
 @PointClass base(BaseSpotLight, BaseLightFalloff, BaseClusteredDynLight)
 	clusteredlight(spot)
+	sphere(nearz)
 = light_rt_spot: "An invisible and directional realtime spotlight."
 	[
 	]