Console sidebar improvements

Sidebar:
- Adjust vertical spacing of general section
- Rename 'General' section to 'Router Info' and move ident info to h3 tooltip
  (ticket #1996)
- Replace 'Short Router Info' with a new 'Advanced Router Info' section in
  default advanced sidebar (adds memory usage and clock skew)
- Add optional embedded bandwidth graph (experimental)
- Add optional memory usage bar
- Add optional Advanced Peers section (adds failing and banned peers)
- Add Help link to 'I2P Internals' section
- Add help page anchored links and troubleshooting to 'Help & FAQ' section
- Add download progress bar for router and plugin updates
- Add 'Advanced Minimal' sidebar configuration
- Add Jobs and Events links to Advanced section
- Add additional reachability states for clockskew and vmcomm (with icons)

Homepage: Add 'Customize Sidebar' link to signpost the feature now that there
  are more optional sections available (ticket #1996)

apps/routerconsole/java/src/net/i2p/router/update/UpdateHandler.java

@@ -49,7 +49,7 @@ class UpdateHandler implements Updater {
             return null;
         UpdateRunner update = new UpdateRunner(_context, _mgr, type, method, updateSources);
         // set status before thread to ensure UI feedback
-        _mgr.notifyProgress(update, "<b>" + _mgr._t("Updating") + "</b>");
+        _mgr.notifyProgress(update, "<b>" + _mgr._t("Updating") + " I2P</b>");
         return update;
     }
 }