Use new downloader methods.

Change-Id: I38151f7c99de90b06e9a29c81e351361d9c6f75b
Depends-On: I5200f8d84e409cb71c5f7338bca18af6de4c0726
Depends-On: I5330ef3fe6d9d6893a933d6639a2cd586ffddbfa
Reviewed-on: http://gerrit.dmdirc.com/3602
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Chris Smith <chris@dmdirc.com>
Update submodules: plugins (new commits), util (new commits)

plugins:
    fae999a Greg Holmes <greg@dmdirc.com>
            Use new downloader methods, falling back to static if required.

            Depends-On: I5200f8d84e409cb71c5f7338bca18af6de4c0726
            Depends-On: I38151f7c99de90b06e9a29c81e351361d9c6f75b
            Gerrit: http://gerrit.dmdirc.com/3601

util:
    7170cf6 Greg Holmes <greg@dmdirc.com>
            Make Downloader non static

            Gerrit: http://gerrit.dmdirc.com/3600

Change-Id: I6429fbc2532c0d6141f2a45b91fd57b772f9ada3