message: Make script/standard's BaseHash Span-convertible
diff: @@ -79,6 +79,9 @@ public:
  {
  return m_hash.size();
  }
  +
  + unsigned char* data() { return m_hash.data(); }
  + const unsigned char* data() const { return m_hash.data(); }
  };
  /** A reference to a CScript: the Hash160 of its serialization (see script.h) */
  