Takes ABC notation from STDIN and prints out tin whistle diagrams.
$ cargo run < examples/scale.abc
D E F# G | A B C# d | e f# g a | b
| . | . . . . | .
● ● ● ● | ● ● ○ ● | ● ● ● ● | ●
● ● ● ● | ● ○ ○ ● | ● ● ● ● | ○
● ● ● ● | ○ ○ ○ ● | ● ● ● ○ | ○
● ● ● ○ | ○ ○ ○ ● | ● ● ○ ○ | ○
● ● ○ ○ | ○ ○ ○ ● | ● ○ ○ ○ | ○
● ○ ○ ○ | ○ ○ ○ ● | ○ ○ ○ ○ | ○