Make Vulnerability objects comparable by value

[SaberStrat]

Enables comparison of two Vulnerability objects by their fields' values.

Implements #463

[nscuro]

@SaberStrat FYI the build failures should be fixed by #469, I am currently waiting for a review on that. Once merged, you can rebase your branch and the build will work.

[VinodAnandan]

@SaberStrat thank you for your PR. The #469 PR has been merged. Could you please rebase your PR?

[SaberStrat]

Rebased for #469

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.89%	✅ 0.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (31c2226)	5956	4400	73.88%
Head commit (8b67e69)	6029 (+73)	4400 (+0)	72.98% (-0.89%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#464)	73	0	0.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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