[suggestion/feature addition] Check: Settings & lookup switching

[XenonUnity]

Since I use Lagg's warnsystem cog over core warnings the check cog and displaying warnings isn't exactly very useful for me because it doesn't show warnings issued from it. If it's possible, could you add an option in settings to switch between whether you are using core warning or 3rd party warning
[p] checkset (or something like that) lookup <core/warnsystem/any other warning cog the user might use) would be an example command. The user can then switch between fetching data from core or warnsystem easily.

As well as lookup data switching, I also think having a [p] checkset command to tweak what data should and should not be displayed when running check. Currently it fetches economy data but what if you want it to only display warn history, past names and creation/join dates. Having the ability to specify what should be shown would be a nice little bonus for people who want specific details