Cleanup getting values from schedule data

- Add type annotations,
- Cleanup logic,
- utils.parse_time now accepts to time format strings.

Konrad Mohrfeldt authored 2 years ago and Ernesto Rico Schmidt committed 2 years ago

The image attributes on our models were using VersatileImageField before
our migration to a separate image model. VersatileImageField uses a
VARCHAR field internally that cannot be converted to a ForeignKey.

Signed-off-by: Ernesto Rico Schmidt <ernesto@helsinki.at>

- remove ThumbnailsMixin and thumbnails fields,
- remove image_* fields and theis usage,
- use utils.delete_links function

Replace ModelWithImageFields with foreign key to Image.

- remove ThumbnailsMixin and thumbnails fields,
- remove image_* fields and theis usage,
- use utils.delete_links function

Replace ModelWithImageFields with foreign key to Image.

- remove ThumbnailsMixin and thumbnails fields,
- remove image_* fields and theis usage,
- introduce utils.delete_links function

Replace ModelWithImageFields with foreign key to Image.

Fixes #141

- add `includeVirtual` as GET parameter for `json_playout()`
- refactor `json_playout` to be cleaner

Closes: #120

- remove remaining usage of naive datetime objects
- refactor json_day_schedule and json_playout views
- remove unused methods in TimeslotManager