Add Snurtle Shell Armor auto-hide support

[victorpopkov]

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Is your feature request related to a problem? Please describe.

Related to #1. But for a Snurtle Shell Armor.

Describe the solution you'd like

To have a separate configuration to control this behaviour. By default, should only work whenever you are following someone and have already been hidden beforehand.

Describe alternatives you've considered

If applicable, add a clear and concise description of any alternative solutions or features you've considered.

Additional context

If applicable, add any other context or screenshots about the feature request here.