Add usePolling option to dirWatch. Needed when monitoring network folders

docs/config/dir-watch.md

@@ -33,7 +33,10 @@ The *rdioScanner.dirWatch* property an *array* of *dirWatch objects* which descr
 
                 // [optional] The type of the audio file
                 // It can be "default", "sdrtrunk" or "trunk-recorder"
-                "type": "default"
+                "type": "default",
+
+                // [optional] Set this to true to successfully watch files over a network
+                "usePolling": true
             }
         ]
     }

server/lib/rdio-scanner/dir-watch.js

@@ -38,6 +38,7 @@ class DirWatch {
                     awaitWriteFinish: true,
                     ignoreInitial: true,
                     recursive: true,
+                    usePolling: typeof dirWatch.usePolling === 'boolean' ? dirWatch.usePolling : false,
                 });
 
                 watcher.on('add', async (filename) => {