MAGN-108. Workspace migrations.

Converted workspace migrations to use workspace migration attribute similar to that used on nodes. Tested with initial migration to convert XYZZero nodes in workflows to XYZ nodes with default inputs.
Replace XYZZero nodes in several tests with XYZ nodes.
Edited migration for XYZZero node to include newer form XyzZero as well.
Test files have errant 0.7.0 version.
Fix workspace migrations error where it was only updating one node.
Move workspace migrations to static methods in separate class.

Edit the New Sketch Plane custom node to take a default XYZ.
Roll back the version on two view tests to ensure migrations are applied.