Add hotkey to group nodes into a node graph#3002

minhpham1810 wants to merge 7 commits into

AcademySoftwareFoundation:mainAcademySoftwareFoundation/MaterialX:mainfrom

minhpham1810:issue-2018-group-nodes-nodegraphminhpham1810/MaterialX:issue-2018-group-nodes-nodegraphCopy head branch name to clipboard