Added right-to-left and mixed-direction editing.

Each row takes its direction from its first strong character. Outline guides and controls flip sides. Use Format > Writing Direction to set a row’s or a selection’s direction yourself.

• Added Format > Writing Direction for rows and selections
• Added ⌥Return to split text into a new body row
• Added ⌘I for Document Info
• Added type carry-over when pasting into an empty quote or list row
• Changed New Indented Row to ⌥⌘Return
• Changed ⇧⌘Return to insert a row above
• Changed Expand Selection to climb through parent branches
• Changed some command IDs (update custom keybindings)
• Fixed newlines in attribute values breaking Markdown files
• Fixed joining rows in “selected rows only” mode moving children
• Fixed copying a horizontal rule’s text as a stray embed
• Fixed differently spelled keybindings not replacing each other
• Fixed Commands Explorer showing extension keys over yours

For extension authors: extensions can now be localized and follow right-to-left layout (API 0.76.1).

• Added bike.localize and locales/ for extension strings
• Added bike.layoutDirection; panels get <html dir> and lang
• Added StyleContext.isRightToLeft and OutlineEditor.isRightToLeft(row)
• Added SymbolConfiguration.withLayoutDirection