HALO: Option to pause the underlying app (2/2)

- adds an option to pause the active app when using HALO
- this is enabled by default for devices with low memory
- (currently: <640MB RAM available to the kernel)

Conflicts:
	res/values/strings.xml
	res/xml/tool_bar_settings.xml
	src/com/android/settings/paranoid/Toolbar.java