Added extensions for HTML forms and tables.

* [APP_UI,SC] Removed code relic for opening/closing the menu.
* [HTML_FORM,NEW] New module for HTML form support. Currently contains:
** Input UI (used for SPARQL Web interface.
** Submission form.
** Submit button.
* [HTML_TABLE,NEW] Added option to highlight any number of data rows.
* [HTML_TABLE,EXT] Apply Pure styling for tables.
* [SPARQL_EXT,NEW] Added sparql_rows_to_lists/2 to get rid of the compound terms row/1.
* [SPARQL_EXT,FIX] Added missing indent of first WHERE-line.
* [WEB_CONSOLE,SC] Use the new HTML_FORM module.