Add native Markdown format option to the Send Message node

package.json

@@ -4,12 +4,15 @@
   "description": "Matrix chat server client for Node-RED",
   "dependencies": {
     "abort-controller": "^3.0.0",
+    "commonmark": "^0.31.2",
     "fake-indexeddb": "^6.2.5",
     "fluent-ffmpeg": "^2.1.2",
     "fs-extra": "^11.1.0",
     "got": "^12.0.2",
     "image-size": "^1.0.2",
     "isomorphic-webcrypto": "^2.3.8",
+    "linkifyjs": "^4.3.3",
+    "lodash.escape": "^4.0.1",
     "matrix-js-sdk": "^41.5.0",
     "mime": "^3.0.0",
     "node-fetch": "^3.3.0",