switch: show username as default for character name

[terabyte25]

No description provided.

[fgsfdsfgs]

What if someone's username is "global". Maybe we should make getUsername return "" if it couldn't be obtained and just check it in the path functions.

[terabyte25]

What if someone's username is "global".

You could argue the same for any other default username.

[fgsfdsfgs]

That's true, which is why I'm offering to return an empty string instead.
Saves can still go in global, since that's not much of a problem.

[terabyte25]

Sounds good to me then, I'll revert the last commit in this PR if you push those changes.