[browser] Add pulldown menu and ability to clear permission exception list. Contributes to JB#52493
[browser] Add pulldown menu and ability to clear permission exception list. Contributes to JB#52493

sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser