Update submodules: plugins (new commits)

plugins:
    7ba2ca6 Chris Smith <chris@dmdirc.com>
            Add gradle wrapper

            Gerrit: http://gerrit.dmdirc.com/3895

Change-Id: I1efd586e2fa3ac0a42a2941c17be1d7bb0de9e1d

modules/plugins

@@ -1 +1 @@
-Subproject commit 551a2396ffcc52e8938d7c4fda6fc99a4527963d
+Subproject commit 7ba2ca63f19a6e4115115bc1115fb3d72026299b