Settings: Display up caret for Status and ChooseAccountActivity

Change-Id: Ia9d51b53df8a3eb4c1b9dee1aeefb0b74eac0fde
Settings: Gamma calibration tunables

- Add support for negative values to gamma.
- Remove logs.

Change-Id: Ie06bf68bbc8e875d36966ed7f98a6beadb0169cc