Sheet music bracelet

This is remixed from [Note-Generator](https://www.thingiverse.com/thing:47677). I refactored code and turned it into a bracelet (by the same way of [Generalized zentangle bracelet](https://www.thingiverse.com/thing:1569263)).

Notes may be customized. See [Instructions of Note-Generator](https://www.thingiverse.com/thing:47677) for how to input notes.

For example, the STL example here is the beginning of the song "You are my sunshine", created from the following `notestring`:
- `4:br,4:g1,4:c2,4:d2,bar,2:e2,2:e2,bar,4:br,4:e2,#:d2,4:d2,4:e2,bar,2:c2,2:c2`

The `height` parameter means the height of the area containing notes so a higher `height` makes notes bigger. A higher `radius` may contains more notes.

You may use the `Preview` mode to check whether the notes are right for you..

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- *[OpenSCAD Documentation - Traditional Chinese](http://openhome.cc/Gossip/OpenSCAD/)*
- *[OpenSCAD Documentation - English](http://openhome.cc/eGossip/OpenSCAD/)*

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