current_players.php: add link to send global message
current_players.php: add link to send global message

This feature was requested in 2011! They pointed out that
it may allow new players to more easily get help.

smrealms/smr,hemberger/smr,hemberger/smr,smrealms/smr,hemberger/smr,smrealms/smr,hemberger/smr