This patch
* passes the configuration (`argparse.Namespace`) to the resolver,
* pushes the DLMA code into the main function,
* makes DLMA take a `list[ImageTrainItem]` instead of `data_root`,
* makes `EveryDreamBatch` take `DLMA` instead of `data_root`, etc.
* allows `data_root` to be a list.
By doing these things, both `EveryDreamBatch` and DLMA can be free from
data resolution logic. It also reduces the number of arguments which
need to be passed down to EDB and DLMA.
Damian Stewart