This update brings fixes to several long-standing quirks and updates
syntax highlighting for a few languages.
- Include current line when block indenting (backward compatible with prior behavior of excluding current line when cursor is at the line end)
- Fix text selection visibility over syntax highlighted text
- Fix word wrap for long words
- Bash syntax highlighting: support multiline comments, line width guide
- Nasal syntax highlighting: preliminary support
- XML syntax highlighting: change prettify shortcut to avoid conflict