Clear menus to invalidate auth when public mode is turned off

[NikkiLacrima]

Listening to LM_SETTING_EMPTY for "auth_public".
Uses RemoveMenuStride() to close menu listeners.

Should solve issue #1095

Basic inworld testing done and works so far.

HOW TO TEST:

Check that all normal collar menus still are working ok, with owner and a friend accessing the menus.

Set collar to public and let a co tester who is not owner try that RLV force sit works.
Then let the friend open a RLV/Forcesit meny and just keep it open.
Now change to non public, and after that the friend makes a force sit selection.

• This should now have no effect at all, and friend have to reopen menu

For comparison try the same on a basic 8.2.3 collar

[Medea-Destiny]

Smart solution! How about we extend this with if(sStr=="auth_public" || sStr=="auth_group") to catch the same issue if authed on group and group access is removed?

For 8.4 with LSD auth levels, we can auth locally in oc_dialog listen event to provide fresh auth on each use of dialog. This current fix will mean trusted users lose active menus on changing public access which is a touch weird but a small price to pay to patch a security loophole in 8.3.

[Medea-Destiny]

Code looks right to me

[Pingout]

Looks great.