Closes #4621

The identifier-quote that a language uses around identifiers can now
be defined using "identifierQuote" when defining a mimetype.
Previously, backticks where hardcoded, but this is not standard SQL
(which uses double quotes). For example, SQLite defines double quotes
as preferred way to quote identifiers:
http://sqlite.org/lang_keywords.html

... in a 3-editor view, by immediately syncing the scrolling from the
left to the right and vice-versa.

Issue #4607

Issue #4608

Closes #4605

js-yaml doesn't always provide line/mark data for certain exceptions;
handle this scenario more gracefully

Closes #4600

Issue #4575

Issue #4575

Issue #4575

Issue #4575

Issue #4559

Issue #4559

Issue #4572

Issue #4572

Closes #4549

Issue #4537

To forbid using the comment strings from their inner modes

Closes #4562

Issue #4560

Issue #4556

Closes #4554

Closes #4548

Closes #4526

Issue #4492

Since showing it next to an empty chunk looks bad

Issue #4492

Issue #4485

Issue #4485

Closes #4478

It sometimes produces invalid output.

Closes #4410

Issue #4413

Adds an option to keep the active line highlighted even when text
inside the line is selected.