feat(ColorMaps): Add inverted grayscale colormap preset

Author: jadh4v

Sources/Rendering/Core/ColorTransferFunction/ColorMaps.json

@@ -601,6 +601,12 @@
          0.9820137900379085
       ]
    },
+   {
+      "ColorSpace" : "RGB",
+      "Name" : "Inverted Grayscale",
+      "NanColor" : [ 1, 0, 0 ],
+      "RGBPoints" : [ 0, 1, 1, 1, 1, 0, 0, 0 ]
+   },
    {
       "ColorSpace" : "RGB",
       "Name" : "BkRd",