Issue #4175

Closes #4080

Issue #4057

Closes #4057

See https://discuss.codemirror.net/t/width-of-sql-hint-dropdown-in-firefox-is-not-always-correct/757

See https://discuss.codemirror.net/t/dynamically-switch-mode-with-sql-hint-addon-bugs/751

Issue #3974

Even if we don't use promise internally, check for the existence of
`.then` attributes on the return results of a hinting function, and if
so assume it is a promise.

Internally also convert all hinters to use the asynchronous interface
for consistency and simplification of code paths.

Closes #3971

Closes #3849

Closes #3847

Issue #3636
Issue #3698

So that tiny mouse motions don't keep resetting the selected item

Closes #3698

Make this the default

Issue #3636

Moving the mouse will change the selected hint option

Issue #3525

Issue #3525

- Provide custom list through CodeMirror hintOptions to kickoff
  autocompletion for domain specific usage.

See http://discuss.codemirror.net/t/tern-webworker-causing-hint-flickering/300

See http://discuss.codemirror.net/t/tern-special-characters-causing-issues/294

Issue #3243

Issue #3229

Issue #3189

Clean up duplicated logic

Issue #3189

And do capture enter presses in this time to allow
quickfire completion.

Issue #3157

Backspace now brings back the completion widget.

Closes #3162

Closes #3141

We're still targeting ES3.

Issue #3095

Issue #3089