Replace loads of servers with connections.

Change-Id: Ia569d12d8d53797ef7378ceab2ba1f5bda3affdc
Depends-On: I11efabb2757d8e62127b6487cbeb62d240cbd891
Reviewed-on: http://gerrit.dmdirc.com/3873
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>