META: Neos 9 Updates & Deprecations

[JamesAlias]

This is what we have in mind for now. Feel free to discuss and update.

Tactical Changes (Features)

• [x] https://github.com/neos/neos-ui/issues/3546
• Upgrade React
• Upgrade CKEditor (Typescript rewrite has release candidate)
• New Drag&Drop
  • Related: https://github.com/neos/neos-ui/issues/2763
• New Date&Time Picker
• New MediaUI into core ( @Sebobo, @JamesAlias )
• New Workspace Module UI into core ( @Sebobo, @ahaeslich, @JamesAlias )

Strategic Changes

• Deprecation of current extensibility APIs in favor of clear, typed, async API that does not expose internals
• New Backend communication API (https://github.com/neos/neos-ui/pull/3331#issuecomment-1518032438) ( @grebaldi )
• Rethink approach for use cases in which currently ClientEvil is used
• Rethink React & CKEditor upgrade cycles/strategies (We have to expose them and need to think about how and how often to upgrade (features vs stability))
• Deprecate current theming approach
• Move more code Typescript
• React & Redux
  • use hooks in favor of "props drilling"
  • Fixed, typed APIs for NeosUI Components
  • Re-evaluate current Extensibility and dependency injection of NeosUI Components
• Improve accessibility and UX (meta)
• Archaeopteryx? ( @grebaldi @mhsdesign )
• NeosUI application framework as global, high-level API to scaffold/bootstrap NeosUI and Backendmodule ( @grebaldi )
  • https://github.com/neos/neos-ui/issues/3119
  • No Subrequest for backend modules
  • Frame via JS or Fusion
  • Evaluate Web component approach