Appia

Bring back the command line option to prefer a detector for duplicated channels. Only relevant to some New Shimadzu processors.

This shouldn't break any workflows, but you know what they say.

Mostly an update to make it easier to add and modify processors in the future. A few minor feature additions, like asking the user if they want to add a method/flow-rate pair to their user settings during processing.

I felt bad making a breaking change, so this will try its hardest to move the old config information into the new system. Since Appia didn't used to know where config files are, if you used that method you'll just need to tell it where to find the old file. ENV variables will be transferred to the new user settings system without interaction.

This release moves database access configs from a user-edited JSON file to Appia's new user settings system. This is more flexible and robust than the JSON system, and removes the requirement that the user creates and edits JSON files by hand. This is a breaking change so I guess this should be v8 but it's relatively minor, so I'm simply not going to do that.

If you're already an Appia user, you will have to run `appia utils --database-setup` to add your database parameters.

This also removes the unused Slack options, which cuts out a hefty dependency.

No code changes, just gotta get a DOI