pianoroll improvements:

- add label / activeLabel controls
- add new pianoroll options:
  - fill
  - fillActive
  - strokeActive
  - stroke
  - hideInactive
  - colorizeInactive
  - fontFamily
- add wordfall method
- fix: some haps were drawn with wrong length
- pianoroll labels now use set fontFamily
- hide fold gutter

website/src/repl/Repl.css

@@ -53,3 +53,7 @@
 #code .cm-cursor {
   border-left: 2px solid currentcolor !important;
 }
+
+#code .cm-foldGutter {
+  display: none !important;
+}