Debugger: Slight tweak to text control editor.

- Trigger a caller update on modification as well.

Debugger: Add interface subclasses for table cell editors.

TableCellTextControlEditor:
- Serves as a base for editors that expose their functionality via a
text control. Handles common functionali

Debugger: Add interface subclasses for table cell editors.

TableCellTextControlEditor:
- Serves as a base for editors that expose their functionality via a
text control. Handles common functionality of watching for changes,
validating input, and notifying listeners appropriately.
TableCellOptionPopUpEditor:
- Serves as a base class for editors where the set of possible values
is fixed and known up front. Handles reacting to selection changes
and notifying listeners.

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