should accept an scxml document containing foreach with object literal @array

SCION should allow the following:
```
<scxml xmlns="http://www.w3.org/2005/07/scxml"
  version="1.0">

<state id="uber">
  <onentry>
    <foreach item="it" array="{p1: 'v1', p2: 'v2'}">
      <log expr="it"/>
    </foreach>
  </onentry>
</state>

</scxml>
```

The scjson-analyzer should allow a literal when parsing the array expression

[1] https://www.w3.org/TR/scxml/#foreach