Friend accept command

[Kevkof 806]

There are commands to accept group(/groupaccept) and clan(/clanaccept) invites, but none was added to accept friendrequests(/friendaccept). 

I'd love to see that added to the game. Might seem small to some but still

[vsb 6171]

seconded

[ShyLO 40]

I will have a dev take a look at possibly implementing this in a future patch. Thanks for the suggestion!