Each of these strings would previously rely on StringView's char const*
constructor overload, which would call __builtin_strlen on the string.
Since we now have operator ""sv, we can replace these with much simpler
versions. This opens the door to being able to remove
StringView(char const*).
No functional changes.
Asking the user for a password is a fairly common thing, so let's have
a reusable GUI dialog for it! This first iteration only supports having
pre-filled "server" and "username" fields. This can obviously be made
more flexible as needs arise. :^)
