[Util] VkAuthManager::IsAuthenticated() and HadAuthentication().
[Util] Added VkAuthManager::justAuthenticated() signal.
[TS] Shorter queue (1 sec instead of 10).
[TS] Use "Authenticate" item instead of a button.
[TS] Removed auth button from the settings.
[TS] No need for AuthCloseHandler.
Merge branch 'master' of github.com:0xd34df00d/leechcraft