Grainy

Fixed
- fix issue with *.* namespacing when applying permissions to data

Fixed
- fix issue with * and *.* namespacing
Changed
- switch to poetry for package management (11)
- switch to github actions (9)

Fixed
- fix issue with permission checks against namespaces starting with a wildcard

Fixed
- bugs with permission checking (10)

Added
- `PermissionSet.update`: add `override` argument

Added
- python3.9 support
- const.PERM_CRUD
- strip argument to Namespace.set and Namespace.__init__ (defaults to True)
- NamespaceKeyApplicator
Fixed
- several bugs with implicit and explicit permission checking