Add mostly-working integrity check to xlcore

[reiichi001]

This add an Integrity Check button to XLCore's settings, right below the gamepath text field.

Under the hood, it runs the normal integrity process, but then swaps the path delimiters to backslashes, so they'll line up with a Windows-made integrity report.

I'm not able to make a modal display during the check, or note which file is being checked in a modal and need some help there. If there's a better way to do it, lemme know or please help me fix my code!

After the check has ran, a modal will be displayed with some info on the results, directly copied from the XAML code, so Loc can probably be matched up later to reduce work.