PDT: Merge branch 'blender-v2.83-release'

precision_drawing_tools/__init__.py

precision_drawing_tools/pdt_library.py

precision_drawing_tools/pdt_menus.py

precision_drawing_tools/pdt_msg_strings.py

precision_drawing_tools/pdt_tangent.py

precision_drawing_tools/pdt_trig_waves.py