first commit
CSS edits, queue-based flood fill, canvas extended to 100 lines, slight refactoring.
Assigned tools to their respective scripts, added README.
Fix for flood fill bug: full blocks now written when background and foreground colours match.
Added undo.
Added Color Brush tool.
Added the vertical block brush, and grid overlays.
Added mirror mode.
Added documentation for mirror mode.
Added modal-dialog box functionality.
Split various functions into separate files, more modular design.
Removed old files.
Added extended brush.
Updated documentation.
Added text tool. 
Added text-tool documentation.
Replace XBin export with ANSi export.
Added load tool, renamed export as save.
remove old file.
Add darken and brighten tools.