VisualEditor/Roadmap

This is a quick set of bullets on the current and near-term work to make VisualEditor better. This is not set in stone, just an outline of our current thinking. Feedback, criticism and suggestions are welcome. See also the Editing Team's 2014-15 goals and the team's workboard on Phabricator.

Notes:
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 * 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!