added image and widget layer to DataViewer

modules/gui/src/CMakeLists.txt

modules/gui/src/data_viewer/area_changed_event.cc

modules/gui/src/data_viewer/area_changed_event.hh

modules/gui/src/data_viewer/argand.cc

modules/gui/src/data_viewer/argand.hh

modules/gui/src/data_viewer/data_viewer.cc

modules/gui/src/data_viewer/data_viewer.hh

modules/gui/src/data_viewer/graphics_image_item.cc

modules/gui/src/data_viewer/graphics_image_item.hh

modules/gui/src/data_viewer/graphics_object_base.cc

modules/gui/src/data_viewer/graphics_object_base.hh

modules/gui/src/data_viewer/image_layer.cc

modules/gui/src/data_viewer/image_layer.hh

modules/gui/src/data_viewer/info_panel.hh

modules/gui/src/data_viewer/lattice_layer.cc

modules/gui/src/data_viewer/lattice_layer.hh

modules/gui/src/data_viewer/viewer_graphics_scene.cc

modules/gui/src/data_viewer/viewer_graphics_scene.hh

modules/gui/src/data_viewer/viewer_panel.cc

modules/gui/src/data_viewer/viewer_panel.hh