Complete UI rewrite in Qt

This is a complete rewrite, throwing PySimpleGui out the window and replacing it with Qt. Additionally did the following changes

split code into multiple files
moved columns config into global config,
store vibrance adjusted images in another folder, avoiding issues with stale files when changing,
remove stale cards (e.g. those that were deleted since last launch) from print dict during startup,
add page sizes A3 and A5,
add UI for global configuration,
add a preview view, just to see the layout after generating PDF,
add option to generate guides all the way to the edges of the page,
add option to allow precropped images inside of images/crop.

Closes #4

preshtildeath / print-proxy-prep