[WIP] Adding navigating to clusters and resource pools

Label as WIP.  I'd like comments on using quadicon for Clusters and Resource Pool Icons.
This seems backwards from what @mfalesni suggested, in that it checks to see if any item in `iterable` is in `thing`, and both `thing` and `iterable` must themselves be iterables.

I'm just making sure that you didn't really want this, which checks to see if any member of `items` is in `iterable`:

```python
def any_in(items, iterable):
    return any(item in iterable for item in items)
```

If you're checking to see if any one thing is an iterable, `x in iterable` should be sufficient.