Support Filtering/Display of Custom Context Menu Options by Technique

[ikiril01]

Right now custom context menu options via assets/config.json get applied to all techniques in a layer. It would be great if we could filter/select which techniques specific context menu options get applied to, as it would enable per-technique context menus to be built.

In the JSON, I think this could be implemented as a simple list in the context menu dictionary that acts as a filter:

{
    "label": "foo"
    "url": "https://test.com",
    "limit_techniques": ["T1099", "T1092"]
}

[rjsmitre]

In the case of multi-tactic techniques, we would need a way to specify whether that menu item applied to all instances of the technique or just some...