Add an option for automatic toggling between an ear speaker and loudspeaker based on proximity sensor

[teklabania]

It would be nice to have a feature for automatic toggling between an ear speaker and loudspeaker based on proximity sensor. For example when a phone lays on my desk and I make/pick up a call without raising the device, it should enable loudspeaker so I could talk with free hands. But when I decide to pick it up and bring closer to my ear it would automatically switch to ear speaker and so on.