Print CID-keyed font properties if available.

This is a proposal to add a feature to dump the Registry-Ordering-Supplement info taken by t1cid or cff drivers, and list available CIDs in a compressed syntax. Its is based on the discussion "ftdump can show the CID registry, ordering, and supplement?" in freetype-devel mailing list. Currently, the available CID in CIDFontType 0 are not checked at all, because cid_get_cid_from_glyph_index() checks nothing. My MR to FreeType ( freetype!280 (merged) ) is a proposal to improve it.