Remake kb/button backlight controls as a PowerManager client

PM now has observers for these settings values and applies them in
realtime, so piggyback on those for button light management

Change-Id: I7568069bd6cacf5cbb56c8d0a1746894725b87fa
Add configurable kb/button backlight timeout

Adjust the value for Settings.System.BUTTON_BACKLIGHT_TIMEOUT

Change-Id: Iea534312b09b38a95185d7fc97d922b23faf29e3
Improve button/keyboard backlight code.

- Improve UX
- Deduplicate code

Change-Id: Ie0218de8b83fe49e3fe1d91a64c2522af03ba06d
Display Settings: Better font size control

Use a SeekBar instead of a list/spinner to determine the font scaling.
For consistency, an approximate size (small, normal, etc.)
 and the exact percentage are displayed.

Change-Id: I96f80d93e740a25a6a6890b423a41c3900b93767
Merge "Remake kb/button backlight controls as a PowerManager client" into cm-10.2
Merge "Add configurable kb/button backlight timeout" into cm-10.2
Merge "Improve button/keyboard backlight code." into cm-10.2
Merge "Display Settings: Better font size control" into cm-10.2
Settings: SK translations

Change-Id: Iacf11e099ee385e48ccaabb05b5fc5084822bc9a
Settings: Remove redundant translations

Change-Id: Ia2e4b1efed6f0e8421d4e755b6a740fb4e69ae2f
Settings: merge CyanogenMod

Change-Id: I2ed76b880264a025d2a7a04342edeee2fb0ad88d