Make the Stunner the default process editor.
Tasks:

• Enable Stunner (actually editor is disabled by default via permissions)
• Change asset name for Stunner to "Business Process"
• Change asset name for jbpm-designer to "Business Process (legacy)"
• Also the user should be able to create processes from the "legacy" designer (jbpm-designer)
• Already existing processes should be opened with the "legacy" designer (jbpm-designer)

Integrate this into 7.7.x for next 7.0 ERx/GA release.