Bunkum tokens cached in the AuthenticationService are susceptible to a use-after-free

Impact First, a little bit of background. So, in the beginning, Bunkum's AuthenticationService only supported injecting IUsers. However, as Refresh and SoundShapesServer implemented permissions systems support for injecting ITokens into endpoints was added. All was well until 4.0. Bunkum 4.0 then...