start work on advanced watched directories

core/src/main/groovy/com/muwire/core/files/directories/WatchedDirectoryConvertedEvent.groovy

@@ -0,0 +1,11 @@
+package com.muwire.core.files.directories
+
+import com.muwire.core.Event
+
+/**
+ * Emitted when converting an old watched directory entry to the
+ * new format.
+ */
+class WatchedDirectoryConvertedEvent extends Event {
+    String directoryPath
+}