Version 1.36.2

Added

• Added support for 'nodedef' attributes on MaterialX::Node, integrating this usage into GraphElement::addNodeInstance.
• Added the MaterialX::GeomPropDef class for geometric input declarations.
• Added the Document::getGeomAttrValue method.
• Added the ValueElement::getResolvedValue method.
• Added support for the MATERIALX_SEARCH_PATH environment variable.
• Added support for GCC 8 and Clang 7.

Changed

• Added callbacks Observer::onCopyContent and Observer::onClearContent, and removed callback Observer::onInitialize.
• Moved the standard document library to the 'documents/Libraries/stdlib' folder.