- added pattern checking for vcs urls
- added ERROR and WARNING prefix to messages
- fixed not checking vcs urls in subcomponents

- allow externalReferences source-distribution to not have hashes if vcs is provided

- added api calls to ecosyste.ms
- added placeholder value in case no repositories were found

added obtaining vcs by purl from local json file and replacing 'website' type to 'vcs' for repositories in sbom-updater.py in reference to issue #2

changed reference resolution for schema in sbom-checker.py to avoid "is not a 'uri-reference'" error on Windows

implementation of sbom to csv script

see merge request !1