Update submodules: parser (new commits), plugins (new commits)

parser:
    4d3eb87 Chris Smith <chris@dmdirc.com>
            Final a few things

            Gerrit: http://gerrit.dmdirc.com/3839

plugins:
    9c4991a Chris Smith <chris@dmdirc.com>
            Final all the things.

            Gerrit: http://gerrit.dmdirc.com/3837

Change-Id: I9dad77554ed98d1a28b560da647eaa80f9fc9c50
Fix ChannelDisplayableUserEvent.

It extends ChannelDisplayableEvent, but overrides the display properties
weirdly.

Change-Id: I0be53d090b4161ac8051873cabf796f498e5c4aa
Reviewed-on: http://gerrit.dmdirc.com/3840
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: parser (new commits)

parser:
    789029e Chris Smith <chris@dmdirc.com>
            Tidying.

            Remove pointless super() calls.
            Remove redundant interface decs.
            Remove unnecessary enum annotations.
            Change .length == 0 to .isEmpty.

            Gerrit: http://gerrit.dmdirc.com/3844

Change-Id: Idbbd2cc006f1acef478f5850cc67529d4dbf6794