Move model-specific logic out of GuardianPermission class
#246
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This PR moves the model-specific logic out of
geoinsight/core/rest/access_control.pyand into the model definitions. Now each model that has a rest viewset should implement afilter_queryset_by_projectsclassmethod. TheGuardianPermissionandGuardianFilterclasses leverage those classmethods to determine which objects a user has permission to interact with via the API.Datasets are an exception; their permission structure is separate from Projects, so a subclass
DatasetGuardianPermissionis implemented to specify Dataset permissions.Resolves #208.