Sill v1.6.0

• In VS Code the popup opens at the current cell and holds still while you type.
• Text in the highlighted row turns dark on light accent colors such as yellow.
• Holding an arrow key stops at the end of the list, and a single press at the end wraps round.
• Terminal tabs opened after this update reconnect on the next keystroke when Sill is quit and relaunched, or updated.