Suggestion: HOI4 - Add support for scoped loc

In HOI4 localization of technologies, parties and so on can be customized per tag. When that tag is known in the script itself, for example:
```
TAG = {
communist > 0.1
}
```

Hovering over `communist` should give you the default name in the loc for the communist party and also the one that's defined for the tag `TAG_communist`.

Optionally, it'd be great if all this loc could be resolved to _all_ the scoped locs that key can have, say, by right clicking on it.