Oval-graph

This release contains:
- Fix problem with a combination of parameters --all and --show-filed-rules
- New option --all-in-one that creates all graphs in one file

This release contains:
- Removed pycache and pytest_cache files from package

This release contains:
- Improves error messages
- Resolves variable references
- Fixes problem with notchecked rules
- Fixes Bug caused by negation

This release contains:
- HTML report as one file
- Appends OVAL details about test (Does not implement variable reference)

This release contain:
- ***Performance improve***
- New commands arf-to-json and json-to-graph
- Added new option -o in commands
- Change negation symbol
- labels with information about node type. (Rule/Definition/Extend definition/Criteria/Test)

Initial release