BB10 Cascades UI

Here's an initial implementation of a Cascades UI for BB10. I moved the playbook project into a blackberry-qnx folder so that BB10 and playbook projects could be grouped together. There were a few changes needed in the shared code but I tried to keep as much as possible in the BB10 project.

Currently, the core can be selected using a friendly display name. As an example, I took some of the iOS .info files and added them to a .json file as it's very easy to parse in Cascades/Qt. I also use this to load a default core specific overlay and the rom extension filters. 

I'll keep adding the other options and configurations but this at least is a good base. Let me know if you want things organized a different way, setup differently or any suggestions about the UI layout.

![IMG_00000129](https://f.cloud.github.com/assets/1668758/403294/9ecbebe8-a91a-11e2-9e82-26aba99b305a.png)
![IMG_00000130](https://f.cloud.github.com/assets/1668758/403295/9ed9045e-a91a-11e2-9d90-015f18488944.png)
![IMG_00000131](https://f.cloud.github.com/assets/1668758/403296/9edf2e74-a91a-11e2-9f47-78730e9aa73c.png)
![IMG_00000132](https://f.cloud.github.com/assets/1668758/403297/9ee60cf8-a91a-11e2-806e-6d780ca789e5.png)
![IMG_00000134](https://f.cloud.github.com/assets/1668758/403383/cbd1d082-a91d-11e2-8b0e-7c54a99c1371.png)