Only restore flagged el attribute lookups

Prevents early rendering for views who are bound using `el` but are not restoring to a rendered element.
Cleanup parent registry on view cid change

Prevents a single view from being registered under two different cid values at one time due to changed cid value on restore. This generally would cause an exception on cleanup due to attempting to clean a view that has already been destroyed.
Prevent partial render due to layout children