Support all text encoding declared in the ID3 standard #79
Description
At the moment all the text frame support only UTF16 as text encoding. We should add the possibility to parse and create frame with one of preferred encoding supported by the ID3.
Describe the solution you'd like
All text frame should contains a property `textEcoding, that contains the parsed value for the current text frame or the value set by the library user during text frame creation.
Additional context
See id3.org for the complete list of text encoding supported.