* Plugins: New plugin downloader/installer

* configclients.jsp: Use new WebAppStarter so webapps that are
      started later also get the temp dir, password, and classpath
      configuration just like if they were started at the beginning
    * configupdate.jsp: Delay after checking for update so the
      summary bar will have buttons.

apps/routerconsole/java/src/net/i2p/router/web/SummaryBarRenderer.java

@@ -184,7 +184,7 @@ public class SummaryBarRenderer {
         if (_helper.updateAvailable() || _helper.unsignedUpdateAvailable()) {
             // display all the time so we display the final failure message
             buf.append(UpdateHandler.getStatus());
-            if ("true".equals(System.getProperty("net.i2p.router.web.UpdateHandler.updateInProgress"))) {
+            if ("true".equals(System.getProperty(UpdateHandler.PROP_UPDATE_IN_PROGRESS))) {
                 // nothing
             } else if(
                       // isDone() is always false for now, see UpdateHandler