Decide on log settings for the new tor-launcher
!348 (merged) introduced a few loggers.
They are different objects, which is okay for me, since they can have their own tags that are styled differently in Firefox, in this way.
However, I wasn't consistent with the level to enable, beside writing that I should have added a preference for them.
Should we add this preference/these preferences? And only one to rule them all, or do we want to allow fine-grained control?