Revert "Add Gamma Control v1. Thanks to @paranoidandroid for researching what each gamma value changed so that I could build this interface. It enables the possibility of tweaking whites, mids, blacks, contrast, saturation, brightness and greys. This is a full GPL'ed code and easy to use for any user without any special mumbo jumbo."

This reverts commit a5f7f2b7b182c5a24af3273c30c7412ff1b8b1a5.