Hi! Thank you for making this super useful tool!

Currently xcodes requires superuser privileges to work. As far as I know, this is required to:

• Enable developer mode, calling /usr/sbin/DevToolsSecurity -enable (I'm not sure what's this is for).
• Approve Xcode’s license.
• Install Xcode’s components.

None of this seems like a hard requirement that should make xcodes fail (Xcode will do all this on its first run anyway), so I think adding a --no-superuser option to xcodes install would make sense.

Would you accept a pull request for this?

Thank you!