core: Add a helper for getting a property by string as a string. I've typed this too much.

src/util.js.c

@@ -502,6 +502,24 @@ int tf_util_get_length(JSContext* context, JSValue value)
 	return result;
 }
 
+const char* tf_util_get_property_as_string(JSContext* context, JSValue object, const char* key)
+{
+	if (!JS_IsObject(object))
+	{
+		return NULL;
+	}
+
+	JSValue value = JS_GetPropertyStr(context, object, key);
+	if (JS_IsUndefined(value))
+	{
+		return NULL;
+	}
+
+	const char* string = JS_ToCString(context, value);
+	JS_FreeValue(context, value);
+	return string;
+}
+
 int tf_util_insert_index(const void* key, const void* base, size_t count, size_t size, int (*compare)(const void*, const void*))
 {
 	int lower = 0;