Apply patch 7 from issue #13 - gcc wall

plugins/MatrixVisualizer/Windows/MatrixGLWidget.cpp

src/common/Memory.hpp

src/common/Tools.cpp

src/interface/Node_select.cpp

src/interface/Settings_window.cpp

src/interface/Settings_window.hpp

src/parser/PajeParser/PajeDefinition.hpp

src/parser/PajeParser/ParserDefinitionPaje.cpp

src/parser/PajeParser/mt_PajeFileManager.cpp

src/render/GanttDiagram.hpp

src/render/Render_alternate.cpp

src/render/Ruler.cpp

src/trace/Container.cpp

src/trace/DrawTrace.hpp

src/trace/EntityValue.cpp

src/trace/IntervalOfContainer.cpp

src/trace/Serializer_values.hpp

src/trace/Trace.cpp

src/trace/Variable.cpp