Add overlay to make it possible to rename dwarves on the embark screen

[myk002]

fix bug https://dwarffortressbugtracker.com/view.php?id=12060

Should only show in the context of setupdwarfgame/Dwarves when game.main_interface.view_sheets.open is true and the nickname or custom profession fields are being edited

we can superimpose an EditField to accept the input and commit it when vanilla would