VisualEditor/Roadmap

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Notes:

 * This doesn't cover (anything like) all work of the developers; it misses out work on performance and stability, trivial changes, documentation, packaging, cross-team support, helping users, architectural changes without a user-facing component, …
 * Code should be shipped when ready, not to meet some arbitrary deadline.
 * Items are worked on in parallel and just because it's at the top of the currently-being-worked-on list doesn't mean it will ship first.
 * This list is about functionality, not deployment; however, some items here implicitly block useful deployment.
 * Suggestions about re-prioritising, changing the scope, and others are welcome!