add logic to start and stop filter timers

apps/ministreaming/java/src/net/i2p/client/streaming/StatefulConnectionFilter.java

@@ -0,0 +1,19 @@
+package net.i2p.client.streaming;
+
+/**
+ * A ConnectionFilter that may hold state, can be started and stopped
+ * @since 0.9.40
+ */
+public interface StatefulConnectionFilter extends IncomingConnectionFilter {
+
+    /**
+     * Tells this filter to start
+     */ 
+    public void start();
+
+    /**
+     * Tells this filter to stop and release any resources
+     */
+    public void stop();
+
+}