Fix regression when reading and deleting text in MS Excel edit fields. (#9063)
* Make cursor tracking and announcement of deleted characters working again in Microsoft Excel edit fields. Fix for https://github.com/nvaccess/nvda/issues/9042
* Revert "Make cursor tracking and announcement of deleted characters working again in Microsoft Excel edit fields. Fix for https://github.com/nvaccess/nvda/issues/9042"
This reverts commit c360ddfc6f19dfe070ad536b04c85de250b1a857.
* Add app module for Excel. This simply uses displayModel for edit fields.
* Review actions.
* Update What's new.