Persist script parameters on a per-script basis

[ctrueden]

Right now, the same class (ScriptModule) is always used when calling the PrefService to persist script input values. This means that two scripts which declare the same parameter name, even with different types, will stomp each other.

We should update the framework to use a (quasi?)-unique key per script.

[imagesc-bot]

This issue has been mentioned on Image.sc Forum. There might be relevant details there:

https://forum.image.sc/t/programmatically-updating-the-persisted-value-for-script-parameters/46082/7