Lockscreen targets

Conflicts:

	res/values/arrays.xml
	res/values/strings.xml
	res/xml/settings_headers.xml

Change-Id: I402add01adf554f070eca2edb19d5cfd120e9044
Extra targets

Change-Id: I5b15b5590614c5319adfe03c5ad8d2c1f58cf79e
Lockscreen Shortcut : Delete entry if reset

Delete the entry when resetAll is selected so that original AOSP
behaviour is present, such as magneticTargets.

Thanks Eddy Witkamp for reporting

Change-Id: I04e03336d8f51fd9683f6d859a649a37e68655ba
Settings: Lockscreen Targets Icon Revamp

Adjust the size of custom app icons and resize and round the corners
of gallery icons for a more uniform look.

Before http://imgur.com/cTOqdwX

After http://imgur.com/EKAeFiw

Change-Id: I75f3656ae5b4ac4a4bd1c1cbed6c07ab2863f4fd
Lockscreen Targets : Fix empty magnetic behaviour

When no valid targets are set, set settings to null in order
to enable magnetic targets (aosp behavior)

Change-Id: I0ccaad25cc85f55b99e4c34cb4ffe2d06bda4a80
Lockscreen targets: missing strings

Change-Id: I226b4c679c8e151bf6f854ae3065c4cf783703dc