This might break sites that depend on async linters getting an editor instance
as first arg, or sync linters getting the .options property of the options passed
as second argument. The args passed are now more or less consistent.

Ugh.

Closes #2816

Closes #2813

after header immediately followed by a code block, GFM formatting is
broken (SHA, #issue, URLs).

overlay.codeBlock gets it wrong (false inside fenced block, true after).
Not yet sure why.

Added hawkee.com

Throwing exceptions is a really bad way to deal with unexpected
syntax in a highlighting mode.

Closes #2805

Closes #2810

To make it easy for client code to color completions without clashing
with the selected styling.

Code: Brackets now become black when they are highlighted as "matching".
JSON: key names are now in "white" (json was a bit saturated with orange - keys and string values).
Cleanup: removed some unnecessary rules.
Default face color normalized to #ffffec (was #ffffe9).

Closes #2804

Closes #2796

Closes #2794

It now closes script and style tags when the slash is typed

Closes #2797

It does not happen when measuring a node

Issue #2665

Issue #2765

Issue #2792

Issue #2786

Issue #2714

Fixes detection of Hebrew letters as word characters

Closes #2789

Closes #2783

Closes #2790

Issue #2780