Django-loci

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- [fix] Fixed bug in floorplan fields
- [fix] Fixed bug which caused geographic map to disappears on narrow
screens
- [fix] Fixed bug in JS logic
- [change] Allow to create an indoor location without specifying indoor
coordinates

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- Added support to django 3.0, dropped support for django versions older
than 2.2
- [admin] Fixed UX issue with ``is_mobile`` checkbox

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- Upgraded django-channels to version 2
- Upgraded dependencies (django, django-leaflet, Pillow)
- Geometry shouldn't be allowed to be None if not mobile
- Fixed admin fields hidden by mistake in case of validation errors
- Fixed type ``KeyError`` exception during form validation

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- [tests] Removed duplication of definition of floorplan test file

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- [requirements] Added support for django 2.0

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- [admin] Reusable foreign_key_raw_id template
- [js] Added client side validation for indoor position
- [js] Do not reset indoor form on first load
- [websockets] Do not attempt connection in location add page
- [websockets] Automatically determine ws protocol