Refactoring: rename covid19 to flask_covid19

src/database.py

src/flask_covid19/__init__.py

src/flask_covid19/blueprints/app_all/all_service.py

src/flask_covid19/blueprints/app_all/all_views.py

src/flask_covid19/blueprints/app_mq/application_workers.py

src/flask_covid19/blueprints/app_web/web_services.py

src/flask_covid19/blueprints/app_web/web_views.py

src/flask_covid19/blueprints/data_who/who_views.py

src/flask_covid19_mq/__init__.py

src/flask_covid19_web/__init__.py

src/mq.py

src/web.py