elections2021: Program point import and detail mostly done

.isort.cfg

elections2021/constants.py

elections2021/forms.py

elections2021/migrations/0006_auto_20210511_0048.py

elections2021/models.py

elections2021/parser.py

elections2021/templates/elections2021/_question_block.html

...lates/elections2021/elections2021_program_point_page.html

elections2021/templatetags/__init__.py

elections2021/templatetags/elections2021_extras.py

requirements/base.in

requirements/base.txt