canvas/tmg2html: tiles

[yakra]

• First, take care of older issues.
• Move tiles files to own directory or subdirectory
• Clean out unnecessary maps from canvas directory; delete or move to oldmaps or new subdir as appropriate
• Edit NS-tile2.htm to resemble drawImage.htm
• Edit drawImage.htm to resemble NS-tile2.htm
• See where/when stuff breaks
• Figure out where to go from there