Switch to ConfigProvider in a few places.

Change-Id: Icf36b0475927f8e78a516e713674aa7517ca5b51
Depends-On: I7c3f01392083df4150e80a836c8cb94482b4e9dc
Reviewed-on: http://gerrit.dmdirc.com/2766
Automatic-Compile: DMDirc Build Manager
Reviewed-by: Greg Holmes <greg@dmdirc.com>