refs https://github.com/TryGhost/Ghost/issues/7860
- restores the previous up/down/enter/cmd+backspace functionality
- modifies the `delete-post` modal to accept a hash with an `onSuccess` action
closes https://github.com/TryGhost/Ghost/issues/6974
- update "change password" fields/process to use inline validations
- remove `notifications.showErrors` and update all uses of it to `showAPIError`
- display multiple API errors as alerts rather than toaster notifications
- refactor `notifications.showAPIError`
- remove `notifications.showErrors`, use a loop in `showAPIError` instead
- properly determine the message from `AjaxError` or `AdapterError` objects
- determine a unique key if possible so that we don't lose multiple different alerts
- add `ServerUnreachable` error for when we get a status code of 0 (eg, when the ghost service has been shut down)
- simplify error messages for our custom ajax errors
no issue
- updates `package.json` details to better reflect the separation from the `Ghost` package
- update ember config and all import statements to reflect the new `ghost-admin` module name in `package.json`
refs #5798, closes#5018
- adds new `gh-fullscreen-modal` component - modals are now specified in-context so that they can have deeper interaction with their surrounding components/controller/route, i.e. a modal component can be a thin confirm/deny wrapper over the underlying controller action keeping all context-sensitive logic in one place
- adds spin-buttons to all modals with async behaviour
- adds/improves behaviour of inline-validation in modals
- improves re-authenticate modal to properly handle validation and authentication errors
