"Load Recently Opened Model" should allow removal of files that no longer exist.

[jhardin-accumula]

If a file listed in the "Load Recently Opened Model" list no longer exists, and the user selects it, a "could not access" error is generated. This is totally reasonable.

This dialog should give the user the option to remove that filename from the Recently Opened Model list.

The existing "Clear Menu" option in that menu is too big a hammer. An alternative to the per-failure handling above would be to add a "Clean Up Inaccessible Files" option to that menu, which would just remove any missing/inaccessible filenames.

Use case: repairing a model that has minor corruption on load adds a "{modelname}_fixed" menu item to that list that cannot be removed individually once the clean model is re-saved.