comctl32: Unify the implementation of TOOLTIPS_Show and TOOLTIPS_TrackShow to give tracked tooltips balloon support.

Check that there is a connection before trying to cancel it.

credui: Ensure that the foreground window doesn't get changed while the user is typing in their password.

This doesn't currently work on Wine as LockSetForegroundWindow isn't 
implemented, but when it does it should work nicely.

credui: Add support for saving the credentials input using CredUIPromptForCredentials by calling CredWriteW.