…l of the vestigial event handlers when we switch which tab owns a pane.

- First (not-really-functional) pass at adding move pane to tab functionality. Moving a pane to a new tab seems to work. Everything else is questionable (exceptions abound).
- Set up {Attach,Detach}Pane methods to add or remove a pane from a pane. Detach is slightly different than Close in that we want to persist the tree structure and terminal controls.
- Add `Detached` event on a pane that can be subscribed to to remove other event handlers if desired. Still need to figure out how to handle removing unwanted event handlers on the actual terminal control.
- Added simple WalkTree abstraction for one-off recursion use cases that calls a provided function on each pane in order (and optionally terminates early).

…handlers are removed when a tab gets closed as well. Try to keep active state updated when detaching

…xtra closed handlers if we are moving the root element from a tab. Make sure that we preserve the ids when we attach a child from another tab.

…moved a pane

…t handler.

…ane-to-tab

 Conflicts:
	doc/cascadia/profiles.schema.json
    src/cascadia/TerminalApp/Pane.h
	src/cascadia/TerminalApp/TabManagement.cpp

…ane-to-tab

 Conflicts:
	src/cascadia/TerminalApp/TerminalTab.cpp
	src/cascadia/TerminalSettingsModel/AllShortcutActions.h

…hat kind of split is being made when a pane is attached (so that in the future it doesnt have to always be an automatic split)

…y (e.g. make tab into pane). Make Pane::DetachPane take a pointer to a pane so that any pane can be detached instead of just ones with ids.

…ane-to-tab

 Conflicts:
	src/cascadia/TerminalApp/TerminalPage.cpp
	src/cascadia/TerminalApp/TerminalPage.h

…ane-to-tab

 Conflicts:
	src/cascadia/TerminalApp/Pane.h

…or state after it has been set to nullptr when closing the tab