Keystone 5 Roadmap Items from Keystone 4

[JedWatson]

This issue is to collect Keystone 4 features or feature requests that are on the roadmap for v5. I'll keep the description updated when we put things in scope, and link to issues / tick them off when they're done.

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• Custom actions (Custom Actions #1452)
• Display related items on item details page
• Markdown field type
• JSON field type (JSON/JSONB field type #315)
• Location field type
• Nested fields (may be better relationship management and/or block-based content field) (Nested lists, aka. "repeating fields", "sublists" #195)
• Item History with UI and rollback (Adding a "change log" for lists that records the version history of items #321)
• Allow sorting of related items (for relationship fields, and related items), (AND query refactor #441)

[gautamsi]

Adding more

• Compatibility with v4 View Queries pr Keystone v4 compatibility: View #1024, @keystone-js/view, part of proposed KeystoneJS community effort by @gautamsi
• keyston.populateRelated
• keystone.updateHandler

I am proposing this as part of v4-compat package

[MadeByMike]

All of these have now been better captured with new issues