closes#10643
The async resolver in express-hbs relies on storing the state of the
promises on the `this` value inside of a helper, which is always set to
the `context`. This patch updates our helpers which render templates, to
use `this` as the context when rendering their templates.
refs #10790
- Moved /core/apps into core/frontend
- Moved /core/server/helpers to /core/frontend/helpers along with /core/server/services/themes
- Changed helper location in overrides
- Moved /core/server/services/routing to /core/frontend/services
- Moved /core/server/services/url to /core/frontend/services
- Moved /core/server/data/meta to /core/frontend/meta
- Moved /core/server/services/rss to /core/frontend/services
- Moved /core/server/data/xml to /core/frontend/services