Began exploring editing in the property view with
XtextStyledTextCellEditor.
Have the XtextStyledTextCellEditor only edit a portion of a model such
as a PropertyExpression instead of a whole AadlPackage.
Place the edited value from the XtextStyledTextCellEditor back into the
model.
When editing in the property view, simply replace the text instead of
parsing and linking.
Revert "When editing in the property view, simply replace the text instead of parsing and linking."

This reverts commit c58ed0fe910e283f944ef91d85a3b2492ce0db37.
When editing a property value, modify the model by text replacement
instead of creating, inserting, and linking a PropertyExpression.  Also
update the treeViewer after modification.