Packs cursors into a CURS file.
The first parameter must be the name of the directory which holds the cursor images. This directory must contain cursor images in files named 000.png, 001.png and so on and corresponding cursor transparency mask images (which are normaly black (transparent) and white (opaque) images. They need to be named like 000_mask.png, 001_mask.png and so on.
The easiest way to initialize a cursor directory is using unpackcurs to unpack the original curs file from the game.
The second parameter specifies the filename of the CURS file to write. If the parameter is missing or is "-" then the output is written to stdout.