small issue fixes and updates

• Changes from 10.0.4 to 10.0.5 release
  • src/base64x.js
    • utf8tob64u, b64utoutf8
      replace new Buffer() to Buffer.from() for
      Node.JS deprecation (issue #460)
  • src/asn1x509.js
    • P-256 oid added in OID class (PR #461 #333)
  • src/x509.js
    • document fix
  • tool/tool_csr.html
    • update to show ASN.1 dump of CSR
  • test/qunit-do-base64x.html, npm/test/t_base64x.js
    • update test code to follow above