Downloads HTML escape codes to CSV file (debug table also available)
Run get_html_escape_codes.py to refresh html_escape_codes.csv and out.html.
out.html is the debug output - open in a web browser to view a formatted table of downloaded escape codes.
html_escape_codes.csv is the main output. The first column is the numerical code, the second column is the text-based code if there is one, otherwise "" and the third column is the name of the character. All codes are escaped with "".