Make the ColourManager into a proper class so it can have
dependencies, just like a real boy.
Change-Id: Ib49f046f7dee6f240cb0970603b4fcd3d71f3cba
Reviewed-on: http://gerrit.dmdirc.com/2696
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager