[node] Adding the rendering of the background image among other

I had to use the graphe node to render the image in the back. I also made the node much more adaptable. I'll verify if it works with another set of image.

meshroom/nodes/blender/RenderAnimatedCamera.py

@@ -43,8 +43,8 @@ class RenderAnimatedCamera(desc.CommandLineNode):
             name='cloudPointDensity',
             label='Cloud Point Density',
             description='''Number of point from the cloud rendered''',
-            value=0.50,
-            range=(0.01, 0.75, 0.01),
+            value=0.25,
+            range=(0.01, 0.5, 0.01),
             uid=[0],
         ),
         desc.File(