A new editor toolbar on the web

The editor toolbar has been rebuilt, so tools are grouped where you expect them and the score gets more room. It is open to everyone as a beta: turn it on from the banner in the editor.
- Notation tools are grouped into categories, each with its own keyboard shortcut, shown in the panel as you open it.
- A layout panel for the whole score. Page and staff size, note spacing, bars per line, bar numbering, and your notation and text styles, all in one place, with non-playing instruments hidden in a click.
- An instruments panel in the sidebar. Rename and configure an instrument without leaving what you are working on, and reorder the score by dragging.
- Workflow modes. Point the number keys at articulations, ornaments or dynamics, and make a whole pass over the score without leaving the keyboard.