[AndyB] Search all usernames 1.1

Allows finding all usernames in auto complete fields.
By default XenForo username search fields only finds members if their last activity has been with the past 180 days. This add-on overcomes this limit by searching all usernames.

(Example of username search field)

Questions and answers:
Q: Does this add-on work with other add-ons that have a username search field?
A: Yes.