Add and Test New <table> elements

* HTML_ELEMENTS: Added new features for `text'
* HTML_ELEMENT_HELPER: Removed unused local
* HTML_ELEMENT_FACTORY: Removed unused local
* HTML_TABLE_BODY: Added
* HTML_TABLE_HEADER: Added
* HTML_TABLE_ROW: Added
* HTML_TEXT: Added
* APPLICATION: Removed unused local
* HTML_ELEMENT_TEST_SET: Add more tests of HTML_TABLE et al, plus
HTML_ELEMENT in general

NOTE: The goal of this code and check-in was to prove that the
HTML_ELEMENT class could easily and comprehensively model all HTML
structures and forms by way of the HTML_TABLE and subordinate elements
(header, row, data, and text).