Rework/enhance Control Panel sidebar

Ref #452 
- [x] Rename Dashboard to Status
- [x] Reorder/Move some elements
- [x] Add dummy leaderboards link
- [x] Expose games in context processor. Fixes highlighting of sidebar elements: #451 
- [x] Merge Games/Display/Customization
- [x] Add tabs for the Customization page
How about trying to import it?
```python
try:
    from .....game import cpanel_urls
except ImportError:
    return False
return True
```