Revert "Notifications from lunch_peers sent outside of locked sections (issue #123, issue #125)"

This reverts commit 8267542c1aaf1820bbef2cfaf63feeadd9ee4cb7.
fixing very stupid bug when removing peers before fixing locking
Changing QT Signals' Connection Type to Queued, fixing Issue #125 for
GUI version
Implementing event queue in non-qt notification center (issue #125)
UnitTest-Plugin (issue 129)
Emit Notification on DB Settings change (issue #121) and further
UnitTest enhancements (#1269)
Notification Center unitTest fixed for GUI lunchinator

* can only check results the way I did, when signals are processed in
another thread (see issue #125) - deactivated checking when QT
Notification Center is used
Merge remote-tracking branch 'origin/nightly' into pm