Settings: Notification Shortcuts [2/2]

Patchset 2: Added hide carrier label toggle, added multi-user support,
fixed whitespace, cleanup of code.

AICPfy:
PS2: Rebase

Change-Id: Ief5cc4857dc7ea9fe886f74f09ed14775cf7bb5e
Signed-off-by: STELIX <ssspinni@gmail.com>
Merge "Settings: Notification Shortcuts [2/2]" into kitkat