closes https://github.com/TryGhost/Product/issues/3666
- added computed setting "donations_enabled"
- added logic to persist "donations_suggested_amount" and "donations_currency"
- used "donations_suggested_amount" and "donations_currency" when initiating a new Stripe Checkout for donations
- added copy functionality to "your link" in Tips & Donations settings
refs https://github.com/TryGhost/Product/issues/3648
- Refactored Members API RouterController.createCheckoutSession: Split the method into smaller parts so we can reuse individual parts for the upcoming donation checkout session.
- Wired up donation checkout creation
- Added donation events
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
