Dpaste

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- Mobile view improvements.
- Upgraded django-csp dependency to v3.6 that ships with Django 3.0 support.

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- Dropped support for Python 3.4.
- Dropped support for Python 3.5.
- Dropped support for Django 1.11. ⚠️
- Dropped support for Django 2.0. ⚠️
- Dropped support for Django 2.1. ⚠️
- Added support for Python 3.8.
- Added support for Django 3.0.
- Snippets which are expired are now deleted as soon as they are requested
by a client. It's not necessary to purge them minutely with the
``cleanup_snipppet`` managemenent command. It's still encouraged to have the
management command setup, just run it daily, so snippets which expired but
never got fetched by a client are deleted properly.
- All pages have sane Expire or Max-Age header.
- Onetime snippets which were never viewed a second time are now deleted if
they reach the default expire date.
- New AppConfig setting ``APPLICATION_NAME`` that can be used to replace the
term "dpaste" throughout the UI.
- New AppConfig setting ``EXTRA_HEAD_HTML`` and similars that can be used to
add custom HTML to each template, to easily override the stock UI of dpaste.
- New "Slim" view that displays the highlighted snippet without header,
options etc, and can be iframed.
- Forced line-break for superlongwordsthatwouldexceedthecanvas.
- Local development is no longer centered around ``pipenv``, instead it's using
docker-compose or the classic virtualenv based setups.
- Error pages are now correctly translated.
- Testsuite and Tox uses pytest instead of a homebrewed testrunner.

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- Exclude the local settings file from the pypi release.

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- The compiled static files (CSS, JS) are now shipped with the Pypi package since
its not possible to compile them after installation with pip.

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- "Edit Snippet" panel is now hidden by default to remove visual noise.
- Linux/Unix browsers now use Ctrl+Enter as a shortcut to submit the form.
- Added a dedicated "Copy Snippet" button to copy the content to the clipboard.
- Added "View Raw" option to optionally render the 'raw' snippet content with a
template rather served as plain text. This was added to hinder abuse.
- Added "Json" to the list of lexers.
- Added 'JSX/React" to the list of lexers.

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- Django 2.1 support and tests.
- Django 2.2 support and tests.
- General code cleanup by running the entire codebase through black_.
- Right-to-left support for text snippets.
- dart-sass is now used for SASS compilation.
- Updated lexer list.
- "View Raw" feature can be disabled in app config to hinder abuse.

.. _black: https://github.com/ambv/black