Use stringify to escape newlines on value.

Fixes #1

src/api/routes/tps.js

@@ -125,7 +125,7 @@ router.post("/", async (req, res, next) => {
     {
       "@type" : "vcfg:PropertyUpdateOrCreate",
       "vcfg:name" :"${property.name}",
-      "vcfg:value" : "${property.value}"
+      "vcfg:value" : ${JSON.stringify(property.value)}
     }
   ]`;