Change PropertyInfo members to String.

include/godot_cpp/core/class_db.hpp

@@ -99,6 +99,13 @@ private:
 	static void initialize_class(const ClassInfo &cl);
 	static void bind_method_godot(const char *p_class_name, MethodBind *p_method);
 
+	static _FORCE_INLINE_ char *_alloc_and_copy_cstr(const char *p_str) {
+		size_t size = strlen(p_str) + 1;
+		char *ret = reinterpret_cast<char *>(memalloc(size));
+		memcpy(ret, p_str, size);
+		return ret;
+	}
+
 public:
 	template <class T>
 	static void register_class();