Debugger: Add variable editing utility window.

VariableEditWindow:
- Implement container window for variable value editors. While
not as ideal as initially intended, this will handle presenting va

Debugger: Add variable editing utility window.

VariableEditWindow:
- Implement container window for variable value editors. While
not as ideal as initially intended, this will handle presenting value
editing to the user until more work is done on the table cell editing
aspect of things.

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