Before this change, you had to modify a fragile data-structure
containing all providers. This often led to things being out of order,
duplicates and conflicts whilst merging. As well as the changes for
one provider being in different places across the file.
After this change, new providers are defined in an easy to edit YAML file,
one per provider.
The config output has been tested before and after for all providers
and any changes are cosmetic only.
