Update submodules: plugins (new commits)

plugins:
    2e0a59b Chris Smith <chris@dmdirc.com>
            Daggerify the DCC plugin.

            Rename old DCCPlugin to DCCManager and inflate it using dagger.

            Also remove unused method in OsdPlugin.

            Depends-On: I99ebc7d10f558008a7889252cc3c96f39747303e
            Gerrit: http://gerrit.dmdirc.com/2861

Change-Id: Ic1d6241590082573cb225d8006d61d642d19efd3
Use ProGuard to find dead code.

Add ProGuard as a dependency, and add a report target to generate a list of
dead code.

Includes a bunch of rules to keep obvious things we access via reflection,
but there's probably a lot more that needs adding.

Change-Id: I4ff6fc0b44c80ff6863f5f24995f4e7cb8e60293
Reviewed-on: http://gerrit.dmdirc.com/2862
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>