dualboot-bt-link-keys: Copy Bluetooth link keys from Windows to Linux

Hello Rustaceans. I thought I might add some homegrown organic Rust code amidst all the slop.

I sometimes have the misfortune of booting up my Windows installation on another partition, and when I pair my bluetooth headphones there, it gets all fucked up on the Linux side, so I re-pair on the Linux side, which fucks up the Windows side like a whack-a-mole.

The correct solution is described in https://wiki.archlinux.org/title/Bluetooth#Dual_boot_pairing, but I really didn't like any of the existing tools for this and thought I could torture myself a bit with Windows registry stuff.

Anyways, the tools works (on my machine). Would be cool if anyone else was looking for a standalone tool that "just werks" without old-ass crusty (no offense) chntpw.

No AI was used in this project. Cheers!