CVSS might be inserted as a number

[multiflexi]

This adds very simple option to insert and store CVSS as a number.

This is not the best solution and it should be improved:

1. When CVSS is inserted, colored boxes showing three scores should display it too as in case when vector is inserted.
2. Calculator button should work when a number is inserted instead of vector.
3. Values and vector should be inserted and stored separately - but the input should be maybe mutually exclusive. This would enable the use of both vector and values in presenter.
4. Because of introduction of CVSS 4.0, new calculator (and string parsing) is necessary too.

[milankowww]

You are very correct in your assessment that values and vector should be inserted and stored separately. This has been planned for a long time, and we will have to do it soon. For the time being, I'm leaving this PR open.

[milankowww]

I have pulled the text from our internal specs into issue #165.

[Progress1]

I enhance little bit this request in #203 Allow store CVSS as number, so i close this (same changes + some additional fixes)