Method constructor

src/lib/libembind_gen.js:14–18

(typeId, name, destructorType)

  $PrimitiveType: class {
    constructor(typeId, name, destructorType) {
      this.typeId = typeId;
      this.name = name;
      this.destructorType = destructorType;
    }
  },
  $IntegerType: class {
    constructor(typeId) {