Published on 2020-04-17.

* refactor(web/engine): precomputation for OSK key events, headless production thereof (#2969)
* refactor(web/engine): initial ModelManager split (#2974)
* refactor(web/engine): lm-layer enablement state management rework (#2975)
* refactor(web/engine): predictive data routing, LanguageProcessor as EventEmitter (#2976)
* refactor(web/engine): web-core build prep (#2982)

Minor fixes and performance improvements