We need some way to prevent components from being unregistered if they're not contained in the parent component DOMNode

[ElliotNB]

TXMBase is designed to unregister and delete components if they are found to not be contained within the DOMNode of a parent component after a refresh. TXMBase was built this way in order to prevent memory leaks after successive component refreshes and updates. However, it is possible that we want to display a registered component for the first display, hide it for another display mode and then display it again on a successive refresh into another display mode. We need to figure out a way to only unregister the components that have no possibility of being displayed again.

[ElliotNB]

Proposed rules for component refresh clean-up:

1. If component XYZ is not contained in the DOM, then
   A. If component XYZ is registered into a repeatable section AND the repeatable section is still present, then component XYZ gets unregistered.
   B. Else if component XYZ does not belong to a repeatable section and there was another (newer) component registered using the same tag name, then component XYZ gets unregistered (because the new component replaces it).
2. If component XYZ is contained in the DOM, then it does not get unregistered.

[ElliotNB]

This could be more easily solved by ignoring the unregistration and deletion of components that are registered outside of the ._render method.