refs https://github.com/TryGhost/Team/issues/1216
Some email security clients are scanning links at delivery, rather than
at the point the user clicks on them. This is causing magic links to
expire. To get around this we're increasing the grace period in which a
link can be used multiple times to 10 minutes.
refs https://github.com/TryGhost/Team/issues/1107
- updated schema validation to allow `'image'` through as a known setting type now that Admin has support
- added transformation of setting values for `'image'` types because they will be URLs and should be stored with `__GHOST_URL__`
refs https://github.com/TryGhost/Team/issues/1106
- updated schema validation to add `'boolean'` as an allowed `type` value
- added `format()` and `parse()` methods to `CustomThemeSetting` model to match `Settings` model behaviour for boolean-type settings
- this is a small part of a bit of cleanup of our test files
- the goal is to make the existing tests clearer with a view to making it easier to write more tests
- this makes the test structure follow the codebase structure more closely
- eventually we will colocate the tests as we break the codebase down further
