[Tools] Duplicate Deleter for .lvl / .nxlv

[WillLem]

Attached here is a simple program that can find and delete any .lvl files that have a corresponding .nxlv file with the same name in the same folder. Particularly useful if you're doing a lot of old-to-new formats conversions and want a quick way to keep things tidy!

A confirmation dialog shows which files are set to be deleted before the deletion process begins.

The .lvl files to be deleted are moved to the recycle bin, so they can be recovered later if necessary.

Hope this helps!