[processing] fixed update of toolbox after editing script providers #4206
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@nyalldawson I found some issues with the alglist and the registry, probably stuff that you forgot to update in the python code after moving the registry to core. Please, take a look at this when you have time. Basically, it makes the provider correctly update and the toolbox be refreshed, once a new script is added (or any provider that might change its content at runtime, such as the modeler provider)
If you can think of any other area where similar issues might appear after your changes, let me know so i can check and work on it.