Only the text component is implemented but this shows the whole application framework, works!
Next items to work on are:
- a simple dialogue to allow the user to specify properties of the score, e.g. the size and orientation of the paper, how many staff lines per page
- controllers for the text components, mouse, keyboard, actions for adding new, moving, deleting (ensuring can't delete title!)
- file open, save, saveas
- work on the staff line class - draw the lines