Typescript migration

* config.js
* Added typesafe validation of config.json.

package.json

@@ -46,15 +46,20 @@
         "request": "^2.88.0",
         "scribe-js": "^2.0.4",
         "serve-static": "^1.14.1",
+        "sparkson": "^1.3.3",
         "sqlite": "^3.0.3",
         "sqlite3": "^4.1.1"
     },
     "devDependencies": {
+        "@types/command-line-args": "^5.0.0",
+        "@types/command-line-usage": "^5.0.1",
         "@types/compression": "^1.7.0",
+        "@types/deep-extend": "^0.4.31",
         "@types/express": "^4.17.4",
         "@types/graceful-fs": "^4.1.3",
         "@types/lodash": "^4.14.149",
         "@types/node": "^13.11.0",
+        "@types/nodemailer": "^6.4.0",
         "bower": "^1.8.8",
         "escape-string-regexp": "^2.0.0",
         "grunt": "^1.0.4",