treat endchar operator with 4 arguments as seac operator (fix #322) #323
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Added handling of the endchar command with seac-parameters in CFF fonts.
See The Type 2 Charstring Format spec section "Appendix C: Compatibility and Deprecated Operators" (page 35)
https://adobe-type-tools.github.io/font-tech-notes/pdfs/5177.Type2.pdf
and Adobe Type 1 Font Format spec (page 50)
https://adobe-type-tools.github.io/font-tech-notes/pdfs/T1_SPEC.pdf
This fixes #322 and fontkit will then pass the Unicode test case CFF-3.