Entity-path order is not stable with new blueprint

[jleibs]

The real root cause of:

• Objectron broken w/ new blueprint model #2176

Is that the entity-path query-order can change on storing/retrieving the space-view blueprint from the store.

This allows for numerous "unstable" bugs that result in flickering, etc.

We should define a reasonable order and always use it stably.

[abey79]

Easy to reproduce/test of a behaviour that's likely due to this issue:

flicker.mp4