Pdfcropmargins

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New features:

* Added the option ``--screenRes`` to pass in the full screen resolution (if
the size-detection algorithm fails) and ``-guiFontSize`` to set the font size
in the GUI.

Changes:

* Python 3.7 now required due to requirements of Pillow and PyMuPDF.

Bug fixes:

* Sizing of the GUI for smaller screen resolutions has been improved.

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New features:

* Windows can now be resized and the preview will be redrawn to match.
Page rendering to the GUI has also been improved.

Bug fixes:

* Added a fallback for some systems (KDE) which were failing to detect the
correct screen size for the GUI.

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New features:

* Added an option ``--prevCropped`` (``-pc``) which just tests whether or not the document was
previously cropped with pdfCropMargins. This is meant for scripting use.

Bug fixes:

* Fixed a bug in returning error codes when running from the command line.

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New features:

* The GUI layout has been rearranged for more intuitive use of the options that take
four values, one for the left, bottom, right, and top margins.

* The GUI now displays the minimum cropping delta values as buttons which take you
to that page. This is helpful for fine-tuning cropping without cropping-out useful
information.

* Page numbers and uniformOrderstat widgets in the GUI were changed to spinners.

Bug fixes and maintenance:

* Internally, functions were renamed to match the recent PyPDF2 deprecations.

* Fixed bug caused by adding pdfcropmargins as an alias.

* Fixed bug when uniform mode not selected, and extend min delta display to both
cases.

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Bug fixes:

* Fixed a bug where a file with unreadable metadata can have a bad attribute access.

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Bug fixes:

* The precision of the cropped point values for the new margins is now limited (to 8 after
the decimal) to avoid possible problems with some PDF viewers.