Add support for untracked files.

Untracked file glob patterns are stored in the servermeta.json. See the README for detailed information.

package.json

@@ -27,6 +27,7 @@
   "homepage": "https://github.com/dscalzi/Nebula#readme",
   "devDependencies": {
     "@types/fs-extra": "^9.0.1",
+    "@types/minimatch": "^3.0.3",
     "@types/node": "^12.12.58",
     "@types/triple-beam": "^1.3.2",
     "@types/yargs": "^15.0.5",
@@ -40,7 +41,8 @@
     "dotenv": "^8.2.0",
     "fs-extra": "^9.0.1",
     "got": "^11.6.2",
-    "helios-distribution-types": "^1.0.0-pre.1",
+    "helios-distribution-types": "^1.0.0-rc.1",
+    "minimatch": "^3.0.4",
     "moment": "^2.27.0",
     "node-stream-zip": "^1.11.3",
     "toml": "^3.0.0",