Add missed MOVESET for simple types

Without that my compiller GCC 9.3.0 says:
`undefined reference to `void picojson::value::set<double>(double&&)'`
when i try set any value like this:
```
picojson::value val();
val.set<double>(5.);
```

picojson.h

@@ -415,9 +415,14 @@ SET(int64_t, int64, u_.int64_ = _val;)
     type_ = jtype##_type;                                                                                                          \
     setter                                                                                                                         \
   }
+MOVESET(bool, boolean, u_.boolean_ = std::move(_val);)
 MOVESET(std::string, string, u_.string_ = new std::string(std::move(_val));)
 MOVESET(array, array, u_.array_ = new array(std::move(_val));)
 MOVESET(object, object, u_.object_ = new object(std::move(_val));)
+MOVESET(double, number, u_.number_ = std::move(_val);)
+#ifdef PICOJSON_USE_INT64
+MOVESET(int64_t, int64, u_.int64_ = std::move(_val);)
+#endif
 #undef MOVESET
 #endif