Issue #4824

This reverts commit e7b737c8.

This prevents the test case search_expandingCaseFold from hanging in
Firefox 54 on Linux.

See https://discuss.codemirror.net/t/gfm-mode-doesnt-seem-to-respect-codeblock-mode-specific-indentation/1286

Issue #4819

into a form that CodeMirror can understand.

Ref: https://www.postgresql.org/docs/10/static/sql-keywords-appendix.html

Issue #4784

Issue #4787

Since moving the highlighting frontier forward when doing
things like getTokenAt is not safe at all.

Also properly update highlighting frontier when a change
happens.

Closes #4813

This way it can be included more easily with javascript bundlers like
browserify/sheetify

Issue #4809

Issue #4803

Default this to true when the fat-cursor style is active.

Issue #4803

leave the old one for now

Issue #4800

(see grzegorzmazur/yacas#231)

Closes #4785

Closes #4786.