Add Filters to User Search

[indo2042]

For level search there are filters so you can search for levels on LBP1, 2, 3, or Vita by using the "game:" filter. This should be carried over to the user search so players can easily find other people who are online; there could also be a potential new "on:" filter so players can search for PS3/PSV/RPCS3/(eventually) VITA3k users.