Add NameConstraints extension and modify getEncodedHex to tohex

• Changes from 10.5.15 to 10.5.16 (2022-Apr-08)
  • src/asn1x509.js
    • NameConstraints and GeneralSubtree class added
    • add support for nameConstraints in Extensions class
    • remove old GeneralName code
  • src/x509.js
    • getExtNameConstraints and getGeneralSubbtree method added
    • add support for nameConstraints in getParam method
    • X509.getParam supports optional arguments:
      • tbshex: to return hexadecimal tbsCertificate value
      • nodnarray: delete array member of subject and issuer
        in the result.
  • src/x509crl.js
    • X509CRL.getParam supports optional arguments:
      • tbshex: to return hexadecimal tbsCertList value
      • nodnarray: delete array member of subject and issuer
        in the result.
  • src/asn1.js
    • ASN1Object.tohex() method added
    • ASN1Object.getEncodedHex() method is now DEPRECATED.
      Please use ASN1Object.tohex() instead.
    • clean up some codes
  • src/*.js
    • update for ASN1Object.tohex()
  • test/qunit-do-x509-ext.html
    • getExtNameConstraints and getGeneralSubtree method test added
  • test/qunit-do-asn1x509.html
    • NameConstraints and GeneralSubtree class test added
  • test/qunit-do-asn1-newobj.html
    • int and tag test refactoring
    • bugfix