------------------
- Review text extraction logic;
it is now possible to ignore parts of the text via a blacklist of CSS classes accessible in the control panel configlet.
[rodfersou, hvelarde]
- To avoid displaying the 'Listen' button with an incorrect voice,
the feature is now globally disabled by default at installation time.
[hvelarde]
- ResponsiveVoice library is now only loaded when needed.
[hvelarde]
- The 'Listen' button is now shown only after ResponsiveVoice library has been loaded.
[rodfersou]