BLD-364: Merge fields.
Add view for checkbox.
Add fixes.
Add new field type.
Add fixes.
Add tests.
Add fixes.
Add fixes.
Add unit tests.
Add additional field 'download_video'.
Add fixes.
Fix acceptance test.
Fix label.
Add migration.
Address comments.
Fix unit tests.
Fix import/export.
Fix unit tests.
Add unit tests.
Fix tests.