First implentation of export to plain text, Ticket0267
Export basically works, but the UI isn't there yet
Added a selectContent method to the cursor API
Added paragraph export, Ticket0267
Extracted textBefore/After and added them to CursorApi
Added jumpLine on right arrow, in crown, Ticket0560
Ticket0560: Wrap up keyboard shortcuts for the crown
Bug fixed on an empty tree in validateTree