Easier UX to configure a roll

[amclain]

Metadata for a roll of film can be tedious to enter as YAML when transcribing the data for an entire roll of film and there are a lot of repetitive settings. However, the YAML file is still useful for the application to store and consume the data, or light user edits. Try an alternative UX to generate the YAML file, like a CLI with default values that can be entered through quickly.