The following things are improved/updated in this revision:
1. MultipleStaff placed inside a Flickable and it automatically adds one more staff if the last staff is full and flicks to the bottom of the view when done.
2. GCButtonScroll added to let the user know that it's flickable (and also flick up/down through it).
3. Previous overridings have been fixed.
4. Piano placed below staves on vertical mode.
5. Improved the save feature function (getAllNotes()). However this is temporary to get the things work as per current notation. Will be easily updated with the new notation when it's finalised.