Add consistency: SwitchPerferences over CheckboxPreferences

- Developer Settings
- Accessibility
- Date and Time
- Button Settings

Change-Id: I830adeb7dfd94726594b9d7879776c6717bed3b9

Conflicts:
	res/xml/accessibility_settings.xml
	res/xml/development_prefs.xml
	src/com/android/settings/ButtonSettings.java
	src/com/android/settings/DevelopmentSettings.java
	src/com/android/settings/accessibility/AccessibilitySettings.java