Add tags

[W3ndige]

By tagging different entities, user will be able to extend the analysis with the manual input usually not possible to gather by the system. In future, such tagging could allow for better similarity predictions, partially assisted by the user/analyst. Example of such information can be:

• Malware family.
• APT group name.
• String origin (for example string discovered in samples from certain APT group)
• Minhash origin (for example function used in legit binary, etc)

Proposed tags:

• Tagging malware samples will allow user to input his own information about the sample such as family, group, etc.
• Tagging strings.
• Tagging minhash.

Optional:

• Tagging relations.

For function similarity, see #5.