Decouple saving from sharing

[shannonturner]

From Youtube:

This update looks amazing! I can’t wait for the new features! A feature I’d like to request is a button which when clicked, will take you to a page with all of just your own maps. It could be called “Saved Maps” or something and could be in the same section as the blue buttons. I’d like this because as of right now, if you save a map, you’re forced to upload it at the same time. This is just a minor inconvenience if you want to save your map, but aren’t ready to share it yet, so it’d be nice if those two features were separated. Other than that, the new features you plan on introducing the public to look and sound great! I can’t wait for the update. Keep up the great work as always! 😊

This would probably require a login system (see #48) but is a bit distinct.