Add initial implementation of rings for Saturn

data/scene/saturn/saturn.data

@@ -1,5 +1,5 @@
 return {
     FileRequest = {
-        { Identifier = "saturn_textures", Destination = "textures", Version = 1 }
+        { Identifier = "saturn_textures", Destination = "textures", Version = 2 }
     },
 }

data/scene/saturn/saturn.mod

@@ -42,6 +42,17 @@ return {
         },
         GuiName = "/Solar/Planets/Saturn"
     },
+    {
+        Name = "SaturnRings",
+        Parent = "Saturn",
+        Renderable = {
+            Type = "RenderableRings",
+            Frame = "IAU_SATURN",
+            Texture = "textures/saturn_rings.png",
+            Size = { 0.140220, 9.0 }
+        },
+
+    },
     -- SaturnTrail module
     {   
         Name = "SaturnTrail",