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/AtomConverter.cpp

@@ -28,7 +28,7 @@
 #include <sstream>
 #include "json.hpp"
 #include "ss.hpp"
-#include "lv2/atom.lv2/util.h"
+#include "lv2/atom/util.h"
 
 using namespace pipedal;