Settings: use DefaultContainerService for all file operations

For devices with non-emulated storage, the system uid is not allowed
to access the storage (to prevent system_server from being killed
on UMS mount). Old code remain that make file access directly, change
those to use DefaultContainerService

Depends on http://review.cyanogenmod.org/28179

Change-Id: Ie6bdaf27249daeabdc7f0ef1d73d484764ee35f0

Conflicts:
	src/com/android/settings/deviceinfo/MiscFilesHandler.java
WifiDisplay: Add an HDCP toggle

Some WFD dongles have frequent (or permanent) failures while
negotiating HDCP with the device, so add a toggle to allow
skipping HDCP entirely

Change-Id: Ia70122d63aa76bcb91428152f588c4d6dd2b610f

Conflicts:
	res/values/strings.xml

Conflicts:
	res/values/strings.xml