Load a default config when a default can't be located

The config package will use default.yaml for us, but most deployments won't have set that up correctly so instead we offer sensible defaults in addition to the thing from config.

src/config.ts

@@ -57,4 +57,42 @@ interface IConfig {
     };
 }
 
-export default <IConfig>config;
+const defaultConfig: IConfig = {
+    homeserverUrl: "http://localhost:8008",
+    accessToken: "NONE_PROVIDED",
+    pantalaimon: {
+        use: false,
+        username: "",
+        password: "",
+    },
+    dataPath: "/data/storage",
+    autojoin: false,
+    autojoinOnlyIfManager: false,
+    managementRoom: "!noop:example.org",
+    verboseLogging: false,
+    logLevel: "INFO",
+    syncOnStartup: true,
+    verifyPermissionsOnStartup: true,
+    noop: false,
+    protectedRooms: [],
+    fasterMembershipChecks: false,
+    automaticallyRedactForReasons: ["spam", "advertising"],
+    protectAllJoinedRooms: false,
+    banListServer: {
+        enabled: false,
+        bind: "0.0.0.0",
+        port: 5186,
+    },
+    commands: {
+        allowNoPrefix: false,
+        additionalPrefixes: [],
+    },
+
+    // Needed to make the interface happy.
+    RUNTIME: {
+        client: null,
+    },
+};
+
+const finalConfig = <IConfig>Object.assign({}, defaultConfig, config);
+export default finalConfig;