Switch from ajv to io-ts for config validation; validate configs on save in the API/dashboard; start work on creating io-ts schemas for all plugins

package.json

@@ -18,7 +18,6 @@
     "test": "jest src"
   },
   "dependencies": {
-    "ajv": "^6.7.0",
     "cors": "^2.8.5",
     "cross-env": "^5.2.0",
     "dotenv": "^4.0.0",
@@ -26,7 +25,9 @@
     "eris": "^0.10.0",
     "escape-string-regexp": "^1.0.5",
     "express": "^4.17.0",
+    "fp-ts": "^2.0.1",
     "humanize-duration": "^3.15.0",
+    "io-ts": "^2.0.0",
     "js-yaml": "^3.13.1",
     "knub": "^20.1.0",
     "last-commit-log": "^2.1.0",
@@ -57,6 +58,7 @@
     "@types/cors": "^2.8.5",
     "@types/express": "^4.16.1",
     "@types/jest": "^24.0.11",
+    "@types/js-yaml": "^3.12.1",
     "@types/lodash.at": "^4.6.3",
     "@types/moment-timezone": "^0.5.6",
     "@types/node": "^10.12.0",