Settings: SlimRecents: user configurable default expanded mode (2/2)

A lot requests to customize the default behaviour
auto = like it is now....dependend on the overlay the first tasks are expanded other collapsed
always = always all expanded
never = always all collapsed

Of course still user changes directly in the recent panel counts more then the default settings
behaviour

PS:
- capitalize strings

Change-Id: If4cc010592e60415dd37af1131408d861f0f4e45

Conflicts:
	res/values/slim_arrays.xml
	res/values/slim_strings.xml
	res/xml/accessibility_settings.xml
	src/com/android/settings/accessibility/AccessibilitySettings.java