Enhancements & Bug Fixes

- Updated to Lightweight Charts 4.1
- Topbar menu widgets will now scroll when a large number of items are added to them
- Vertical Spans can now be placed on Line objects

Bugs
- Histograms will now be deleted from the legend
- autoScale is reset to true upon using `set`.

lightweight_charts/js/callback.js

@@ -90,6 +90,9 @@ if (!window.TopBar) {
             menu.style.border = '2px solid '+pane.borderColor
             menu.style.borderTop = 'none'
             menu.style.alignItems = 'flex-start'
+            menu.style.maxHeight = '80%'
+            menu.style.overflowY = 'auto'
+            menu.style.scrollbar
 
             let menuOpen = false
             items.forEach(text => {