When enabled, AltStore will ignore cached responses for certain requests and will always make a new request to the server. This is useful for development when repeatedly testing changes to remote files.
Limited to UpdateKnownSourcesOperation for now, but will eventually affect fetching sources as well.
If source is already added, the error message will list all installed apps from the source.
If adding source for first time, the error message will mention exactly which apps have been blocked from the source (if provided).
