added several missing exports. first working version of the DOKK game

examples/dokk/datafiles/thrombin/ligand.sdf

examples/dokk/datafiles/thrombin/protein.pdb

examples/dokk/datafiles/thrombin/surface.face

examples/dokk/datafiles/thrombin/surface.vert

examples/dokk/dokk.py

examples/dokk/glwin.py

examples/dokk/level.py

examples/dokk/ligand.py

examples/dokk/protein.py

examples/dokk/surface.py

modules/geom/pymod/export_composite3.cc

modules/geom/pymod/export_mat3.cc

modules/gfx/pymod/export_entity.cc

modules/gfx/pymod/export_scene.cc

modules/mol/base/pymod/export_entity.cc