[cairo] [cairo-script] add working mod, cvi, cvr operators

[Zack Weinberg]

I'm not sure this is the right list to send this to, but I don't know
about any separate list for cairo-script, so...

For some experiments I was doing I needed integer remainder and
real<->integer conversion operators in cairo-script.  The attached
patch adds them, with Postscript-compatible names and semantics.
I had to expose parse_number from csi-scanner.c.

zw
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