Do not enable Camera widget on non-camera devices

Change-Id: Ib8b945aaf23ecaaf70e6d8ca466d54d97f9982a0
Update 'Wi-Fi display' string to 'Cast screen'

Change-Id: I7205a9bc96d0d560334ecd801511b617d5e1f304
Merge "Do not enable Camera widget on non-camera devices" into cm-11.0
Merge remote-tracking branch 'github/cm-11.0' into cm-11.0