Stop using ResourceManager methods some more.

Change-Id: Ie8f2c6abe05eac9897cada8e17b67ed1d982d95e
Depends-On: Ic48f35315ff795c6dd44bf24190ca19581ca71d3
Reviewed-on: http://gerrit.dmdirc.com/4078
Reviewed-by: Chris Smith <chris@dmdirc.com>
Automatic-Compile: DMDirc Build Manager