Add a button to launch Beat Saber

This is a common feature in mod managers for other games. Would be very helpful. Thanks for considering!

I believe this would be possible, considering the old ModSaber Client had this feature. Where would you want the button to be in the UI?

I would just expect it to be easy to find. Maybe could go right here: https://i.gyazo.com/93556666f6157012465ef6b9a272001f.png