Settings: Lockscreen custom wallpaper (2/2)

 - created a listpreference which changes the lockscreen background style
   (eg. Color Fill, Custom Image and default)
 - using the switch the preference for alpha seekbar (custom image only)
   or ColorPreferencePicker switches.

 *** added all necessary colorpicker java files and custom seekbar java

PatchSet 2: fix commit message

PatchSet 3: rebase

PatchSet 4: remove all duplicate files based on what Danesh suggested

PatchSet 5: missed removing the colorpickerpreference I created from
            lockscreen settings

PatchSet 6: fix wrong key for Lockscreen Category

change-Id: I1ac1351e9a31a5827847e30113e933f2b7da219f

Conflicts:

	res/layout/slider_preference.xml
	src/com/android/settings/cyanogenmod/LockscreenInterface.java
	src/com/android/settings/cyanogenmod/SeekBarPreference.java
Merge github.com:ResurrectionRemix/Resurrection_packages_apps_Settings into kitkat1
Fix memory leak in ManageApplication

ApplicationsAdapter new a Session member and make it has a reference to
it self. If we don't release it explicitly, the cross reference will
cause memory leak.

Change-Id: Iecce35ae1d56d98cee6347e84d3a3ff57f3b15a5