[Core] Added FindQtKOauth to global cmake/ instead of Azoth's.
[Blasq Spegnersi] Use global FindQtKOauth.
[Azoth] Allow finding global QtKOAuth.
[Core] Support finding QtKOAuth built for Qt5.
[Blasq DN] Removed unused signals.
[Azoth Xoox] Support QXmpp built for Qt5.