Some more fixes and new features

It's been a little while, eh? Turns out I've had time to learn computer vision concepts a bit more academically, so that'll hopefully be useful.

In this version:
*Custom Decklists should actually function now
*A new option on the settings pane to re-select your webcam source without closing the program
*A new preprocessing step to hopefully get better recognition in general, especially on cards with dark or low contrast artwork. May not play well with old set files, but shouldn't entirely break functionality

I'm hoping to improve recognition speed and rework the GUI to be more... usable in the future.

~404