Make the colormap behavior in the viskores ANARI device match helide (vistle#535)

- Ensure m_inTransform and m_inOffset are applied in Image1DSampler (through a new worklet).
- Add m_useValueRange and m_valueRange to the viskores device's Geometry class, so the user can set the range used for the color map themselves 
(more detailed explanations see PR)

Author: DeVasconcelos

.gitmodules

@@ -62,7 +62,7 @@
 	url = https://github.com/vistle/tetgen.git
 [submodule "lib/3rdparty/viskores"]
 	path = lib/3rdparty/viskores
-	url = https://github.com/Viskores/viskores.git
+	url = https://github.com/DeVasconcelos/viskores.git
 [submodule "lib/3rdparty/mpi-serial"]
 	path = lib/3rdparty/mpi-serial
 	url = https://github.com/vistle/mpi-serial.git

lib/3rdparty/viskores

@@ -366,10 +366,12 @@ void AnariRenderObject::create(anari::Device device)
     if (haveColor) {
         anari::setParameter(device, mat, "color", "color");
     } else if (useSampler) {
-        if (colorMap)
+        if (colorMap) {
             anari::setParameter(device, mat, "color", colorMap->sampler);
-        else
+            anari::setParameter(device, geom, "useValueRange", true);
+        } else {
             anari::unsetParameter(device, mat, "color");
+        }
     } else if (hasSolidColor) {
         anari::setParameter(device, mat, "color",
                             anari::std_types::vec4{static_cast<float>(solidColor[0]), static_cast<float>(solidColor[1]),