Provide the bare minimum for customizing loot messages

[lunatic-gh]

Is your feature request related to a problem? Please describe.
Sometimes we are in need of customizing what loot counts as "issues". E.G. when using plugins like Root Builder, there will be tons and tons of "Mods Installed incorrectly" for mods like Engine Fixes or SKSE.
However those messages cannot just be "disabled" at all.

• Removing those checks from the masterlist does not help, since anytime you run loot it just re-downloads a new one.
• Creating a userlist does not do anything, since it doesn't modify your checks, but rather adds additional checks.

Describe the solution you'd like
Something to be able to modify the errors and warnings it spits out.

Describe alternatives you've considered
Pain.

Additional context
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