Folder structure for Plans

🚧 THIS IS A TICKET MIGRATED FROM UPVOTY. The original ticket and comments will be available for a limited time over at:
https://abrp.upvoty.com/b/request-a-feature/folder-structure-for-plans/
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It would be great of we could create some folders to group plans. I created multiple trips that span multiple days and the list of plans is getting long and harder to organise.