PalmVE: Ham Tests

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* Mostly internal and architectural changes to use more modern APIs.
* Restore some missing context menus that disappeared when appbars disappeared. Restore the appbars and the menus.
* I wrote PalmVE originally many years ago, in the Cupcake era. Things have changed a lot since then, so this ended up being a very invasive rewrite. Please let me know if you have trouble.