Clean up dependency handling

 - Menu/Comment._dep_expr and Symbol/Choice._menu_dep are really the
   same thing internally in the C implementation (the dependency for the
   "menu node", which is also used to implicitly create menus), and it
   simplifies the code to treat them like that here too.

 - Reuse the calculated _menu_dep (which has parent and 'depends on'
   dependencies) when propagating dependencies to properties.

 - Get rid of the temporary lists. It's now easy to use plain 'for'
   loops to add the properties.

 - Catch attempts to use select/imply from menus and choices early and
   error out.

 - Add comments clarifying which variables are only used when displaying
   items.

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