Support plugin changes.

Change-Id: If8938f708244ed20d8d9e1c481ecb76bd2c0fac5
Depends-On: I053a57b82f77e9f570efdc463f86dd6653355a3e
Reviewed-on: http://gerrit.dmdirc.com/2848
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>