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# __construct()
 -  can take no argument
 -  can take an array of default HTML attributes
 -  throws an InvalidArgumentException if you pass some non existant options
 - The exception contains the non existant option names
# getRequiredOptions
 -  returns an array of required option names
 -  throws an RuntimeException if you don't pass a required option
# ->getOption() ->setOption() ->setOptions() ->getOptions() ->hasOption()
 -  sets an option value
 -  returns null if the option does not exist
 -  returns true if the option exist
 -  returns false if the option does not exist
 -  throws an InvalidArgumentException if the option is not registered
# ->addOption()
 -  adds a new option
 -  returns an array of all options
# ->setAttribute() ->getAttribute()
 -  sets a new default attribute for the widget
# ->getAttributes()
 -  returns an array of attributes
# ->setAttributes()
 -  sets attributes
# ->attributesToHtml()
 -  converts an attribute array to an HTML attribute string
# ->renderTag()
 -  renders a HTML tag with attributes
 -  renders an empty string if the tag name is empty
# ->renderContentTag()
 -  renders a HTML tag with content and attributes
 -  renders an empty string if the tag name is empty
# ::escapeOnce()
 -  escapes an HTML strings
 -  does not escape an already escaped string
 -  does not escape an already escaped string
 -  converts objects to string
# ::fixDoubleEscape()
 -  fixes double escaped strings
# ::getCharset() ::setCharset()
 -  returns the charset to use for widgets
 -  changes the charset to use for widgets
# ::setXhtml() ::isXhtml()
 -  return true if the widget must returns XHTML tags
 -  changes the value of the XHTML tag
# ->getJavaScripts() ->getStylesheets()
 -  returns an array of stylesheets
 -  returns an array of JavaScripts
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