As discussed with the product team we want to enforce kebab-case file names for
all files, with the exception of files which export a single class, in which
case they should be PascalCase and reflect the class which they export.
This will help find classes faster, and should push better naming for them too.
Some files and packages have been excluded from this linting, specifically when
a library or framework depends on the naming of a file for the functionality
e.g. Ember, knex-migrator, adapter-manager
- renames `refSource`, `refMedium` and `refUrl` to `referrerSource`, `referrerMedium` and `referrerUrl` respectively for consistent naming across files and usages
refs https://github.com/TryGhost/Team/issues/1907
- assigns top-level domain as source for external referrers that don't have known mapping
- returns `Direct` as source for new members when no referrer information is found
refs TryGhost/Team#1923
- updates referrer translator logic to use grouping for known domains/urls to calculate source and medium
- returns first external ref url if nothing matches in history in first pass
refs TryGhost/Team#1907
- calculates final attribution source and medium using captured referrer information in history
- adds new referrer-translator that goes through available history and based to determine most valid referrer info
- includes referrer url, source and medium in the attribution data for storage
