Provide a way to export and import custom styles about prettymapp HOT 3 CLOSED

Great idea, I will look into it! Maybe it can just be a json text field with an export/import button, hidden under an expander.

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This would be perfect. Thank you!

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Added an export expander to the streamlit app with the relevant parameters of the map configuration in #19. This doesn't yet allow to reimport the configuration, but think it can still be helpful to have the whole config at one glance and to potentially use with the Python package.

Need to think about a way to enable the import without it becoming too error prone and confusing in the interface for 99% of people who won't use this.

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