Imgwrench

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* :code:`flip` subcommand to flip/mirror images left-right
* Monkey patch :code:`IFDRational.__eq__` method of Pillow in tests to avoid regression with Pillow 7.2.0

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* :code:`-x/--seed` option for collage to control initialization of random number generator

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* collage subcommand for creating a framed collage from images
* BREAKING CHANGE: default method for colorfix is now quantiles-fixed-cutoff
* preserve xmp metadata when :code:`-e/--preserve-exif` is used (in addition to exif metadata)

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* :code:`-m/--method` option to colorfix (default: quantiles)
* add fixed-cutoff as new method to colorfix accepting fixed colors as color cutoff boundaries
* add quantiles-fixed-cutoff as new method to colorfix combining quantiles and fixed-cutoff
* deprecate running colorfix without specifying method (as default will change in next version)

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* add numpy as dependency
* change colorfix algorithm to vectorized numpy code for performance
* support Python 3.8

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* fix crash when orientation is missing in exif headers