Compliancelib

- fix OpenControlFiles crash when OpenControl repo contains no dependencies

- Improve OpenControl narrative parsing to handle narratives that are strings and lists

- OpenControlFiles class generates list of dependencies by item type
- SystemCompliance class consumes content listed in dependencies (but only one level deep, e.g., will retrieve item types that are locally listed in the dependent repository, but will not recursive deeper)
- Technical debt added of possible duplicate keys read from remote repos are not tested again existing keys (e.g., a local component file and dependent component file referring to same ID for component could collide)

- Refactor OpenControlFiles class to read components, standards, certifications from shared methods
- SystemCompliance reading standards and certificaftions
- NOTE: SystemCompliance not yet consuming content from remote dependency repos into

- Add python logging to OpenControlFiles class

- Indicate local repos supported in error message