update tags to use dashes

[nasbench]

This PR updates the tags validator for the following namespaces.

• CVE: Use dash instead of dot to conform with the rest of the tags
• Detection: Use dash instead of underscore to conform with the rest of the tags
• ATT&CK: Use dash instead of underscore to conform with the rest of the tags
• TLP: Use a dash for amber+strict to conform with the rest of the tags

Fixes a couple of typos and added return types to some functions along the way.

All the rules on SigmaHQ rule repo are being updated in SigmaHQ/sigma#4950 to conform with the changes proposed here.

[nasbench]

Sorry for the additional update. But since i changed it in the spec, we need to change it here too.

in the related field the type OBSOLETES will becomes OBSOLETE. Its more accurate to say a rule is obsolete.

[frack113]

LGTM