Clean up protected apps code (1/2)

- Work with actual ComponentNames instead of converting them between
  String and ComponentName all the time
- Name protection state parameter in methods 'state' instead of
  'protect', as a value of true actually means it's not protected. Also
  consistently use the respective constants for its values.
- Some misc. cleanup

Change-Id: I2855978c8aef3cfa14249e3398039c7cdd145ede
Settings : Add tap/pay help url

Change-Id: I41f37dff0fa2eb547f84aaf776950f0f42e6e36f