Djangocms-bootstrap4

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* Added support for djangocms-static-ace to serve the ace code editor locally
* Added support for Django 3.2
* Dropped support for Python 3.7
* Dropped support for Django 3.0 and 3.1

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* Added support for Django 3.1
* Dropped support for Python 2.7 and Python 3.4
* Dropped support for Django < 2.2
* Added support for sorl thumbnail
* Fixed CORS issues with external SVGs
* Fixed link preview not showing the correct icon
* Added documentation information about ``TEXT_SAVE_IMAGE_FUNCTION``

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* Added support for Django 3.0
* Added support for Python 3.8
* Pinned ``django-filer`` to 1.5.0
* Added further tests to raise coverage
* Fixed smaller issues found during testing
* Dropped support for django-filer <= 1.4

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* This update requires djangocms-link>=2.5.0
* This update requires djangocms-picture>=2.3.0
* Added new migrations for bootstrap link and picture plugins
* Fixes offset class not being rendered when set to 0
* Fixes order class not being rendered when set to 0

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* This update requires djangocms-icon >= 1.4.0
* Added support for Django 2.2 and django CMS 3.7
* Removed support for Django 2.0
* Extended test matrix
* Added isort and adapted imports
* Adapted code base to align with other supported addons
* Added option to add custom classes to carousel (82)
* Fixes an issue where ``DJANGOCMS_BOOTSTRAP4_CAROUSEL_DEFAULT_SIZE`` is not honoured
* Fixes an issue on Divio Cloud where the addon is not installing djangocms-icon

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* Fixed a regression where link became required in the carousel