Django-loci

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Work in progress.

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- Refactored code to move logic to helper methods in
AbstractObjectLocationForm

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- [deps] Updated django-leaflet to ~=0.31.0.

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Changes
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- Use ``settings.DEFAULT_STORAGE_CLASS`` as base for OverwriteStorage,
adapting the storage backend to project settings.

**Dependencies:**

- Bumped ``django-leaflet~=0.30.1``
- Bumped ``Pillow~=10.4.0``
- Bumped ``geopy~=2.4.1``
- Bumped ``openwisp-utils~=1.1.0``
- Added support for Python ``3.10``.
- Added support for Django ``4.2``.
- Dropped support for Python ``3.7``.
- Dropped support for Django ``3.0.x``, ``3.1.x`` and ``4.0.x``.

Bugfixes
~~~~~~~~

- Fixed an issue with deleting ``FloorPlan.image`` by using the
appropriate storage backend method.
- Resolved a bug causing outdoor locations to incorrectly appear in the
location list when creating floorplans.

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Bugfixes
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- Updated Pillow to ~=9.1.0 to fix a security CVE
- Fixed channels deprecation warning

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Changes
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- Converted geocoding test to check `90
<https://github.com/openwisp/django-loci/issues/90>`_
- Use ``ReconnectingWebsocket`` to websocket connection `101
<https://github.com/openwisp/django-loci/issues/101>`_
- Dropped support for Python ``3.6``
- Added support for Python ``3.8`` and ``3.9``
- Added support for Django ``3.2.x`` and ``4.0.x``
- Migrated to ``channels~=3.0.4``
- Bumped ``Pillow~=9.0.0``
- Bumped ``geopy~=2.2.0``
- Bumped ``openwisp-utils~=1.0.0``
- Set lowest django version supported to ``django~=3.0.0``