more optimisations

CMakeLists.txt

src/core/PathsBuilder.cpp

src/core/PathsBuilder.h

src/core/PathsExporter.cpp

src/core/PathsExporter.h

src/core/types.h

src/gui/ConfigSpace.cpp

src/gui/ConfigSpace.h

src/gui/PathsTool.cpp

src/gui/PathsTool.h

src/gui/main.cpp

src/libs/hull.h

src/libs/img.h

src/libs/lines.h

src/libs/voronoi.h

src/libs/voronoi_lines.h

src/tools/hull.cpp

src/tools/hull_main.cpp

src/tools/lines.cpp

src/tools/lines_main.cpp