Add a looaaaddd of inspections.

Inspections are fun. A lot of them are things PMD moans about already,
or things we're actively avoiding (pointless @inheritDocs!)

Change-Id: I785fbdce1bf468159ba55747642dfd2d7acd216e
Reviewed-on: http://gerrit.dmdirc.com/3804
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Remove pointless inheritDocs.

Change-Id: I0f9d7bf81ceaa80891279ffa9ff905691474edb0
Reviewed-on: http://gerrit.dmdirc.com/3805
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager
Update submodules: plugins (new commits)

plugins:
    4a70ffd Greg Holmes <greg@dmdirc.com>
            EventBus the TypingLabel.

            Gerrit: http://gerrit.dmdirc.com/3806

    f105588 Chris Smith <chris@dmdirc.com>
            Remove pointless inheritDocs.

            Gerrit: http://gerrit.dmdirc.com/3807

Change-Id: Ic51ea15b8d7186baaae722c3af30281f91a4c293