Bumping them for every release just adds too much git
noise and history blowup.

It was broken and confused.

Make the mode register a list of completable words instead.

Issue #2324

As spotted by the extended linter.

Add CodeMirror.defineOption function for defining new options.

Add findMatchingBracket to the methods exported by this extension.

Closes #746

It is not part of the set of styled classes.