Fix fog to draw Fog Cutoff Distance via a plane, not sphere test

Add support for negative Fog Cutoff Distance on fog to draw it in front of the camera Far Plane, no matter the setup.
Fix hot-reloading Fog shader in Editor.

Content/Editor/MaterialTemplates/Features/ForwardShading.hlsl

@@ -145,7 +145,7 @@ void PS_Forward(
 
 #if USE_FOG
 	// Calculate exponential height fog
-	float4 fog = GetExponentialHeightFog(ExponentialHeightFog, materialInput.WorldPosition, ViewPos, 0);
+	float4 fog = GetExponentialHeightFog(ExponentialHeightFog, materialInput.WorldPosition, ViewPos, 0, gBuffer.ViewPos.z);
 
 	// Apply fog to the output color
 #if MATERIAL_BLEND == MATERIAL_BLEND_OPAQUE