Progressed on implementing @friends

Adding, removing, and opting out now work.

Friend request alerting still doesn't work.
Usernames are now forced to be lowercase

* Also improved the output from @friends/list a bit, somewhat in
response to the lowercase user names.
Finished initial implementation of @page, @friends

Had to do some cleanup to the player_match search function in the
process.  This should be ready for general testing now.