Imgwrench

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* :code:`-r/--repeat` option for repeating input files
* Constrain :code:`click` version to :code:`<8.1` due to breaking API change; this will be relaxed in a future version
* Constrain :code:`Pillow` version to :code:`<9.0` due to breaking tests; this will be relaxed in a future version
* Drop support for Python 3.6 and 3.7
* Add support for Python 3.9 and 3.10
* Upgrade dependencies
* Migrate from travis-ci.com to GitHub actions

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* Fix support for :code:`click>=8.0` which has changed its behaviour regarding custom parameter types

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* :code:`quad` subcommand supports doubling inner frame using the :code:`-d/--double-inner-frame` flag

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* :code:`collage` subcommand selects best layout based on score function
* :code:`collage` subcommand supports :code:`-n/--number-tries` parameter to specify number of layout tries

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* BREAKING CHANGE: replace golden collage approach with BRIC algorithm in :code:`collage` subcommand
* BREAKING CHANGE: drop support for Python 3.5
* format code with :code:`black`

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* :code:`quad` subcommand to to collect four images into a quad
* improve documentation