[3/3] Settings: Battery Saver mode

Vanir-ized by me:P

PS2: rebased
PS3: Ditched brightness change since it`s useless and added data
on/off
PS4: WI-FI on/off
PS5: derp fixes

introduce battery saver mode
this based from what user want or what user do to saving the battery life
this include:
1. Automatically switch mobile network into what user choice and also disable mobile data IF wifi connected to an AP
2. Automatically switch mobile network and disable mobile data IF battery low (battery level can configure)
3. Reduce screen brightness based low battery (this feature will disabled if Auto brightness mode enabled)
4. Not changing network IF on Call or Usb tether enabled or WifiAP enabled
5. Not changing network IF there is Download/upload progress
6. Support For Both GSM and CDMA devices (need someone to test for CDMA devices)
7. every condition has an option :D
8. Restore all network configuration if Smart Radio disabled
9. Add Time Range to start Smart Radio

Change-Id: I19502c731b74e82a3873f19f51965ee5a88c1f04
Signed-off-by: Dan Trifan <jimsth@gmail.com>