Merge branch 'develop' into mmcifparser

modules/gfx/src/gfx_object_base.hh

modules/gfx/src/gost_exporter.cc

modules/gfx/src/gost_exporter.hh

modules/gfx/src/impl/entity_renderer.cc

modules/gfx/src/impl/entity_renderer.hh

modules/gfx/src/prim_list.cc

modules/gfx/src/prim_list.hh

modules/gfx/src/scene.cc

modules/gfx/src/scene.hh

modules/gfx/src/vertex_array.cc

modules/gfx/src/vertex_array.hh

modules/gfx/tests/test_gfx.py

modules/gfx/tests/test_gost_export.py

modules/gfx/tests/test_gost_import.py

modules/gui/src/CMakeLists.txt

modules/gui/src/data_viewer/mask_overlay.cc

modules/gui/src/data_viewer/overlay_manager_gui.cc

modules/gui/src/gosty.cc

modules/io/pymod/export_map_io.cc

modules/io/src/img/CMakeLists.txt