Picker Updates

- Roots directory no longer uses navigation view
- Roots directory uses different item layouts than navigation
- Dialog header for roots view now correct
- Dialog header now changes layout for roots vs browsing lists
- Dialog header now reflects volume color
- ***NEW: CREATE NEW FOLDERS RIGHT FROM THE PICKER***

CLOUD-180

Change-Id: I2789d11f2315c441b02f4b38218e31d7eacb6efa