MD-Tooltip - Destroy when associated element is removed

[futurethang]

The md-tooltip component relies on talk-back to the md-theme component in order for proper popover operation with the nested shadRoots the library and apps built with it can employ.

This can cause the tooltip itself to persist in view even though the original element it is associated with is gone. E.G. when a button has a tooltip and clicking that button navigates to another page.

Idea: add a one to one relationship between the element wrapped by the tooltip and the popover instance of the tooltip so that the popover's visibility mirrors that of the element it is assigned to.

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