Add first working group <-> room sync

aleksis/apps/matrix/example_data.yaml

aleksis/apps/matrix/filters.py

aleksis/apps/matrix/forms.py

aleksis/apps/matrix/matrix.py

aleksis/apps/matrix/menus.py

aleksis/apps/matrix/migrations/0001_initial.py

aleksis/apps/matrix/model_extensions.py

aleksis/apps/matrix/models.py

aleksis/apps/matrix/preferences.py

aleksis/apps/matrix/rules.py

aleksis/apps/matrix/tables.py

aleksis/apps/matrix/tasks.py

aleksis/apps/matrix/templates/matrix/room/list.html

aleksis/apps/matrix/tests/test_matrix.py

aleksis/apps/matrix/urls.py

aleksis/apps/matrix/views.py

conftest.py