v.0.0.6

• add encoding arguments to functions for working with .TextGrids
• add textgrid argument to the draw_sound() function
• change subgraphs alignment in the draw_sound() function including .TextGrid annotation
• add from and to arguments to the draw_sound() function
• add .mp3 format reading options to all functions that work with sounds
• add text_size argument to the draw_sound() function
• add zoom argument to the draw_sound() function
• add the get_sound_duration() function
• fix ploting of multiple sounds with multiple .TextGrids
• add an argument title_as_filename to the draw_sound() function
• change .TextGrid associated arguments of the create_viewer() function to table argument; as a result users now need to provide a table for the annotation viewer and not a .TextGrid