API change: VisibleLight has spotAngle now

Assets/BasicRenderLoopTutorial/BasicRenderLoop.cs

                 var dir = light.localToWorld.GetColumn (2);
                 lightSpotDirections[i] = new Vector4 (-dir.x, -dir.y, -dir.z, 0);
 
-                float radAngle = Mathf.Deg2Rad * light.light.spotAngle;
+                float radAngle = Mathf.Deg2Rad * light.spotAngle;
                 float cosTheta = Mathf.Cos (radAngle * 0.25f);
                 float cosPhi = Mathf.Cos (radAngle * 0.5f);
                 float cosDiff = cosTheta - cosPhi;

Assets/ScriptableRenderLoop/HDRenderLoop/HDRenderLoop.cs

 
                 if (light.lightType == LightType.Spot)
                 {
-                    var spotAngle = light.light.spotAngle;
+                    var spotAngle = light.spotAngle;
 
                     var innerConePercent = AdditionalLightData.GetInnerSpotPercent01(additionalLightData);
                     var cosSpotOuterHalfAngle = Mathf.Clamp(Mathf.Cos(spotAngle * 0.5f * Mathf.Deg2Rad), 0.0f, 1.0f);

Assets/ScriptableRenderLoop/fptl/FptlLighting.cs

 
                     const float pi = 3.1415926535897932384626433832795f;
                     const float degToRad = (float)(pi / 180.0);
-                    const float radToDeg = (float)(180.0 / pi);
-                    //float sa = cl.GetSpotAngle();     // total field of view from left to right side
-                    var sa = radToDeg * (2 * Mathf.Acos(1.0f / cl.invCosHalfSpotAngle));       // spot angle doesn't exist in the structure so reversing it for now.
-
+                    var sa = cl.spotAngle;
 
                     var cs = Mathf.Cos(0.5f * sa * degToRad);
                     var si = Mathf.Sin(0.5f * sa * degToRad);