Toob Flanger, Stereo Reverb, bug fixes

- support state in factory presets.
- Use uncompressed json for settings files.
- Set current plugin preset name to last loaded plugin preset.
- Append plugins after  start node,  before end node fixed.
- Correctly release web socket when web app goes idle.
- Fit and finish issues.

src/IEffect.hpp

@@ -19,8 +19,8 @@
 
 #pragma once 
 
-#include <lv2/urid.lv2/urid.h>
-#include <lv2/atom.lv2/atom.h>
+#include <lv2/urid/urid.h>
+#include <lv2/atom/atom.h>
 
 
 namespace pipedal {