BUG: Work around a deadlock bug in MSVC2013

Source/DataStructures/imstkGridBasedNeighborSearch.cpp

@@ -64,6 +64,9 @@ void GridBasedNeighborSearch::getNeighbors(std::vector<std::vector<size_t>>& res
         [&](const size_t cellIdx)
         {
             m_Grid.getCellData(cellIdx).particleIndices.resize(0);
+
+            // This line is not logically necessary, but it is needed due to a bug in MSVC
+            m_Grid.getCellData(cellIdx).lock.unlock();
         });
 
     // collect particle indices of points in setB into their corresponding cells