Increase warning level

* Set warning level to /W3 for MSVC to catch more warnings
* remove several excluded checks for clang
* removed several unused variables
* Hide warnings qwt
* add missing parentheses in logical expressions
* Remove double check on same logical expression

ApplicationLibCode/ModelVisualization/Streamlines/RivStreamlinesPartMgr.h

@@ -91,5 +91,4 @@ private:
     caf::PdmPointer<RimEclipseView> m_rimReservoirView;
     uint                            m_count;
     size_t                          m_currentT;
-    bool                            m_showAsVectors;
 };