This allows shift+click/middle+click/num+super Windows and Unity shortcuts to
work as expected while not changing regular launch behavior.

Part of #48

#14464 Preserve editor size when switching layout

Fixes #18159

fixes #18148

fixes #18113

Fixes #18069

**Bug**
Script and style blocks inside markdown cannot contain blank lines

**fix**
Add a specific rule for script, style, and pre blocks according to the common mark spec: http://spec.commonmark.org/0.27/#html-block

fixes #18017

Add F4 shortcut for navigating search results

Improve edit action and search in Settings editor

fixes #17113

Update copyright year to 2017