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.

install.sh

@@ -1,5 +1,5 @@
 #!/usr/bin/bash
-# copy files.
+# copy files to installation directories
 cmake --install build --prefix /usr --config Release -v
 # Done as an install action by the debian package.
 sudo /usr/bin/pipedalconfig --install