icemac / icemac.songbeamer / 11

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Refactored the SNG class:

* Instances no longer store the data on the `data` attribute but it is now a
  subclass of ``dict`` allowing direct dict access to the data.

* It is no longer possible to use attributes on ``icemac.songbeamer.SNG``
  instances to read and store encoded bytes data. Either read/write text data
  from/to the ``icemac.songbeamer.SNG`` instance using the `dict` API or use
  the ``parse`` function (see next item) resp. use ``.SNG.exort()`` to export
  the data encoded.

* Add a function ``icemac.songbeamer.parse()`` convert a byte stream
  into a ``icemac.songbeamer.SNG`` instance. It replaces the class method on
  the `SNG` instance. It returns ``None`` if the data cannot be
  parsed and it logs an error message.

* Add a function ``icemac.songbeamer.open()`` to open a file given by a path
  and get a ``icemac.songbeamer.SNG`` instance.

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