[New] Group Invite

[Myrroddin]

Group Invite automatically accepts group invites from friends and guild members. There are two options, one to turn off accepting from friends, the other for guild members.

The category is subject to change, and is currently Beta AddOns, but should end up in Group, Guild, and Friends.

I completely dry-coded this, and haven't tested it. However, the code is very short, and feedback is welcome.

Thank you, and happy gaming!