* refactored `core/frontend/apps` to destructure common imports
* refactored `core/frontend/services/{apps, redirects, routing}` to destructure common imports
* refactored `core/frontend/services/settings` to destructure common imports
* refactored remaining `core/frontend/services` to destructure common imports
* refactored `core/server/adapters` to destructure common imports
* refactored `core/server/data/{db, exporter, schema, validation}` to destructure common imports
* refactored `core/server/data/importer` to destructure common imports
* refactored `core/server/models/{base, plugins, relations}` to destructure common imports
* refactored remaining `core/server/models` to destructure common imports
* refactored `core/server/api/canary/utils/serializers/output` to destructure common imports
* refactored remaining `core/server/api/canary/utils` to destructure common imports
* refactored remaining `core/server/api/canary` to destructure common imports
* refactored `core/server/api/shared` to destructure common imports
* refactored `core/server/api/v2/utils` to destructure common imports
* refactored remaining `core/server/api/v2` to destructure common imports
* refactored `core/frontend/meta` to destructure common imports
* fixed some tests referencing `common.errors` instead of `@tryghost/errors`
- Not all of them need to be updated; only updating the ones that are
causing failures
* fixed errors import being shadowed by local scope
no issue
- Cache invalidation header was set wrongly in frontend theme service
- This moves cache invalidation out of theme service to themes controller by passing `themeOverriden` flag along with theme
refs #10790
- Following TODO in theme index file was waiting for 2 years, and today is the day to cross it out:
- "Reduced the amount of things we expose to the outside world"
- "Made this a nice clean sensible API we can all understand!" - by @ErisDS
- Cleaned exposed methods from themes module
- Removed unused storage getter
- Removed list method
- Removed validate method
- Renamed Storage to ThemeStorage
- Named the file the same way the class defined inside of it is named
- Naming was conflicting with coming rename of `settings` -> `storage`
- Renamed theme settings to storage