LookdevX files

Adding the LookdevX Maya files generating noise graphs.

See README.md for more info.

contrib/adsk/resources/LookdevX/README.md

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+# LookdevX
+
+Some graphs found in the adsk contrib libraries are authored and generated from LookdevX within Maya.
+This is a work in progress, and LookdevX is changing constantly, but it's so far the most reliable way to author graphs.
+
+How to organize the "MaterialX stack" inside a Maya scene, is also something not well defined yet. Some Maya files might store a single graph, some might store multiple graphs.
+Often graphs are numbered, and the highest number is the most current.
+Some graphs might just be development tests, or usage test. The name is usually self explanatory.
+
+The publishing process is still incomplete, so there is manual work to do, especially to adjust or match node, graphs, and definition names.
+
+Coordinates are not removed when publishing, which might make diffs hard to read sometime. But having coordinates allows us to re-import those graphs back into LookdevX or Graph editor, and keeping the layout is important.
+If options to remove coordinates when publishing will become available, we will consider it, as long as LookdevX becomes our authoring tool of choice.