add config and subcommands

ezau having the watching functionality is nice, but sometimes for
scripts you might want to have the old "upload this single log and post
it to discord" functionality. As such, ezau has now been split into two
subcommands (which use the same core):

ezau watch runs the inotify-based directory watcher to zip and upload
new logs. Additionally, it now respects the "upload = ..." config
settings, which means you can also use it as a zipper only, without
having every log uploaded.

ezau upload performs a single-shot upload with the discord notification.

Furthermore, the discord auth token/channel id have been moved to a
configuration file. Switches to override this for single runs might be
provided in the future, but for now, it seems more sensible to have it
in a persistent configuration.

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