migrations for ClassBase -> ClassDescriptor #219

Job	Run time
Check the access tokens used for publishing	1s
Generate Version-Specific Network Keys	49s
Build for MacOS	2m 34s
Build for Linux	2m 12s
Build for Windows	6m 28s
Debug Build Artifacts	0s
Publish to Forum	0s
Publish GitHub Release	0s
	12m 4s

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