[2/2] Settings: Lockscreen blurred see through

Lockscreen: See through (2/2)

Add the ability to see through lockscreen.
Adapted to kitkat from jellybean by @BigBrother1984

Signed-off-by: D4rKn3sSyS <jesdga95@gmail.com>
Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

PS2:

* Indenting and fix of the LOCKSCREEN_SEE_THROUGH variable check.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

PS3:

* Add see through checkbox to security_settings_chooser.xml, reflects the security_settings_lockscreen.xml.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

PS4:

* Made the option available with every lock mode (PIN, Password etc.) cause it works with every mode now.
* Update description with better one.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

PS5:

* Make description more like aosp strings.

Signed-off-by: Carlo Savignano <stevewatersy@gmail.com>

Change-Id: Ife993ffe0833be98fe582146fc071f339445bbc5

Conflicts:
	res/values/pa_strings.xml
	src/com/android/settings/SecuritySettings.java

Fix: Ensure lockscreen see through setting persists after reboot

If see through was enabled and the device was rebooted,
the user had to toggle the setting off and on again to activate.

Change-Id: Ic743986d9b0abae138e2291864ce527c4f9ff864

Conflicts:
	src/com/android/settings/SecuritySettings.java

Conflicts:
	res/values/slim_strings.xml
	res/xml/security_settings_lockscreen.xml