Add distrometa.json for storing distribution wide metadata.

The distrometa.json file is stored at {ROOT}/meta/distrometa.json.
You can generate it by rereunning the init root command.
It behaves exactly the same as the servermeta.json file.

package.json

@@ -27,12 +27,12 @@
   "homepage": "https://github.com/dscalzi/Nebula#readme",
   "devDependencies": {
     "@types/fs-extra": "^9.0.1",
-    "@types/node": "^12.12.43",
+    "@types/node": "^12.12.47",
     "@types/triple-beam": "^1.3.1",
     "@types/yargs": "^15.0.5",
-    "@typescript-eslint/eslint-plugin": "^3.1.0",
-    "@typescript-eslint/parser": "^3.1.0",
-    "eslint": "^7.1.0",
+    "@typescript-eslint/eslint-plugin": "^3.2.0",
+    "@typescript-eslint/parser": "^3.2.0",
+    "eslint": "^7.2.0",
     "rimraf": "^3.0.2",
     "typescript": "^3.9.5"
   },