Use a common base class for HW tuning sliders.

Change-Id: I61b458ffb08eb765f8a720657056243f56e76f17
Cleanup: Use a helper class for system setting binary toggles.

Change-Id: Iad7f8a6bf85b23223e1def18e8c9eaa0f8dd253c
Cleanup: Don't use getApplicationContext() where not needed.

Change-Id: Ie2232857cf88c98c9f2b76996a500e3d3696e6e2
Cleanup: remove useless checks.

Change-Id: I73c5c432cb384cbc28d584d751d6e9955a3eda05
Merge "Use a common base class for HW tuning sliders." into cm-10.2
Merge branch 'cm-10.2' of git://github.com/CyanogenMod/android_packages_apps_Settings into cm-10.2