This is the start of all changes needed to support entirely private
instances, where all blogs are only visible to other authenticated users
on an instance (ref T576). It begins by changing how Handler methods check an
endpoint's permissions.
- Renames UserLevelLEVEL consts to UserLevelLEVELType
- Adds UserLevelLEVEL funcs with same names as previous consts. Each
returns a UserLevel
- Adds a new UserLevelReader that restricts access based on app
configuration. This is now used on collections and posts.
- Changes routing a bit so static files are always accessible
- Adds a new interface, Apper, that enables loading and persisting
instance-level data in new ways
- Converts some initialization funcs to methods
- Exports funcs and methods needed for intialization
- In general, moves a ton of stuff around
Overall, this should maintain all existing functionality, but with the
ability to now better manage a WF instance.
Ref T613
