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Change-Id: I0882b4bb296af041ec5766ff29a605554f13b0a7
Add option for switching between UMS and MTP/PTP mode. (2/2)

Change-Id: I6cf50a41a9a82e40e702f5231ce663636c149613

This adds support for switching between UMS and MTP/PTP.
Settings part (this part) adds option in USB settings (statusbar/notification drawer) for enabling UMS,
and adds setting in Storage menu to enable / disable UMS, this since the USB settings page disappears when enabling UMS.

It's only porting this http://review.cyanogenmod.org/#/c/21115/
Fix the message when Bluetooth is turning off while on the tethering menu.

Currently says "Turning Wifi off..."
This change will display "Turning Bluetooth off..." instead.

Change-Id: I398f372bed75f16f0da5b4fa89ce6b67e22012c4
Signed-off-by: Ryan Baxter <rbryanbaxter@gmail.com>