Fix lots of various issues failing automated test load/unload/reload.

archimesh/achm_gltools.py

io_coat3D/__init__.py

io_convert_image_to_mesh_img/mesh/dtm.py

io_scene_ms3d/__init__.py

io_scene_ms3d/ms3d_ui.py

measureit/measureit_geometry.py

mesh_f2.py

mesh_inset/__init__.py

modules/selection_utils.py

render_povray/__init__.py

render_povray/render.py

render_povray/ui.py

space_view3d_math_vis/draw.py