Auto-collapse server folders

[dperolio]

Description
A simple plugin that will automatically collapse a folder when moving away from a server in the folder.

Expected behavior
This has been created for Powercord previously: https://github.com/gord-forks/powercord-auto-collapse-folders
However, I have heard it is buggy and not working for some people. Prefer to rewrite it. This could also instead be a settings option built into a more robust, feature-filled 'Improved Servers List' plugin.

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