Add some more server events.

Change-Id: Ib12542d236757d76540d57ff54341e3b73ceb598
Reviewed-on: http://gerrit.dmdirc.com/3437
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>
Update submodules: plugins (new commits)

plugins:
    2dc8ce4 Greg Holmes <greg@dmdirc.com>
            Add some more server events.

            Depends-On: Ib12542d236757d76540d57ff54341e3b73ceb598
            Gerrit: http://gerrit.dmdirc.com/3438

Change-Id: Ibe016c4f752ae7d1cc9dc7c64998bccc240019ec