Solver manager

Because of #142 (closed) I can't write a proper markdown-based description thus I upload a screenshort ...

• remove former StateBlock notification list
• StateBlock::getState returns by copy
• remove StateBlock::getPtr

src/processor_motion.cpp

@@ -250,6 +250,16 @@ bool ProcessorMotion::keyFrameCallback(FrameBasePtr _new_keyframe, const Scalar&
     assert(existing_capture != nullptr
             && "ProcessorMotion::keyFrameCallback: no motion capture containing the required TimeStamp found");
 
+    // If the difference between the found capture time-stamp and the new capture time-stamp
+    // is greater than the time tolerance, abort.
+    if (std::abs(new_ts - existing_capture->getTimeStamp()) > _time_tol_other)
+    {
+      WOLF_DEBUG("Not joinning the key-frame due to time tol : ",
+                 std::abs(new_ts - existing_capture->getTimeStamp()),
+                 " > ", _time_tol_other);
+      return false;
+    }
+
     // Find the frame acting as the capture's origin
     FrameBasePtr new_keyframe_origin = existing_capture->getOriginFramePtr();