New setting: multiline scope

Many thanks for creating this great plugin Isaac :)

I had an idea for an improvement. Displaying the whole scope on one line can be rather difficult to read:

```
Scope: source.python meta.function-call.python meta.function-call.arguments.python meta.item-access.python meta.item-access.arguments.python constant.numeric.integer.decimal.python
```

So I've implemented a "multiline scope" setting, which causes the scope to be split onto multiple lines to make it easier to read:

```
Scope:
    source.python
    meta.function-call.python
    meta.function-call.arguments.python
    meta.item-access.python
    meta.item-access.arguments.python
    constant.numeric.integer.decimal.python
```

I find this really helpful. What do you think?