GUI/ba3d: include paths relative to CMAKE_SOURCE_DIR

GUI/ba3d/CMakeLists.txt

GUI/ba3d/model/model.h

GUI/coregui/Views/RealSpaceWidgets/Particle3DContainer.cpp

GUI/coregui/Views/RealSpaceWidgets/RealSpaceBuilder.cpp

...egui/Views/RealSpaceWidgets/RealSpaceMesoCrystalUtils.cpp

GUI/coregui/Views/RealSpaceWidgets/RealSpaceModel.h

GUI/coregui/Views/RealSpaceWidgets/RealSpaceView.cpp

GUI/coregui/Views/RealSpaceWidgets/TransformTo3D.h

dev-tools/sandboxes/realSpace/demo1/demo_model.cpp

dev-tools/sandboxes/realSpace/demo1/demo_model.h

dev-tools/sandboxes/realSpace/demo1/lattice.h

dev-tools/sandboxes/realSpace/demo1/main.cpp

dev-tools/sandboxes/realSpace/demo1/mainwindow.h

dev-tools/sandboxes/realSpace/demo2/main.cpp

dev-tools/sandboxes/realSpace/demo2/mainwindow.h

dev-tools/sandboxes/realSpace/demo2/modelLayers.cpp

dev-tools/sandboxes/realSpace/demo2/modelLayers.h

dev-tools/sandboxes/realSpace/demo2/modelShowcase.h