Remove a bunch of deprecated methods.

Change-Id: Ia4cf947dd33272021b10d2dc4093f383277eefd2
Depends-On: I06531664f45d26298d989b9ac82d614c67da8c55
Reviewed-on: http://gerrit.dmdirc.com/2775
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>