removed cleaning the root 'build' directory
if card art fails to load, log a SEVERE message, and just skip it
log the cardset title/key at the top of the output, before doing anything else.
changed --output to --output-dir
if there is any error laying out or writing the card to disk, log that at SEVERE and continue on
added printing the cardset title and key as soon as it's loaded, before any other operations are undertaken