closesTryGhost/Ghost#8959
- Treated the search input as a literal string rather than `RegExp` to allow characters that need escaping in `RegExp` and disable `RegExp` characterslike `|`.
- Replaced any non-word characters in `highlighted-text` fn with escaped characters, so they're working with `RegExp`.
no issue
- add eslint-plugin-ember, configure no-old-shims rule
- run `eslint --fix` on `app`, `lib`, `mirage`, and `tests` to move imports to the new module imports
- further cleanup of Ember globals usage
- remove event-dispatcher initializer now that `canDispatchToEventManager` is deprecated
