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/AudioHost.cpp

@@ -188,7 +188,7 @@ private:
     static constexpr size_t DEFERRED_MIDI_BUFFER_SIZE = 1024;
 
     uint8_t deferredMidiMessages[DEFERRED_MIDI_BUFFER_SIZE];
-    size_t deferredMidiMessageCount;
+    size_t deferredMidiMessageCount = 0;
     bool midiProgramChangePending = false;
     int selectedBank = -1;
     int64_t midiProgramChangeId = 0;