Update custom loot zones action

[michaelmeyer26]

Is your feature request related to a problem? Please describe.
The auto-sorting feature is a huge QoL improvement, but for people who have unusual ways of sorting out their stuff it's a bit less useful. Managing many different custom loot zones is currently a hassle, even with the helpful filters you can set up for them.

Describe the solution you'd like
Add a zone manager action that updates the filters on your custom zones to include all of the items inside of them, but only if they weren't already being caught by the custom arguments.

Describe alternatives you've considered
Changing the UI when setting up or editing a custom zone to allow you to see more of the text you've entered.

Creating an "Auto-updating custom loot zone" option separate from the one already available that does this itself without having to add an action.

Additional context
N/A

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