Introduce some helper functions
Add LCD density setting
Add adfree setting

Conflicts:

	res/xml/wireless_settings.xml
	src/com/android/settings/WirelessSettings.java
Add interface category
Add power dialog options

 * Reboot
 * Airplane toggle
 * Screenshot
 * Torch toggle
Revert "Put fragment in specific activity's whitelist"

This reverts commit 37f06a4c87e5b0dbfda75ea76716aafadef66d32.