SystemUI: Squashed support for recents task locking

Author: Anas Karbila <anaskarbila@gmail.com>
Date:   Mon May 1 02:20:07 2017 +0900

    SystemUI: Support recents task locking

    This adds the ability to lock task in recents so they won't be cleared when removing all tasks

    Ticket: NOUGAT-1

    Drawables from material.io

    Change-Id: I06ffe411e72d4e837cfec7b9b77fb2519e417bc7

Author: Joey Rizzoli <joey@lineageos.org>
Date:   Sat Jun 3 17:00:43 2017 +0200

    SystemUI: animate icon when locking a task

    Change-Id: Ic153cb3707a14dba96d8889b11f149a339fb55e0
Signed-off-by: Joey Rizzoli <joey@lineageos.org>

Author: LuK1337 <priv.luk@gmail.com>
Date:   Tue Jun 20 01:28:27 2017 +0200

    SystemUI: Fix task lock & freeform buttons placement

    * Get rid of hardcoded margin
    * Use proper gravity flags for task lock button

    Change-Id: Ib864b23f405ad34a56c37e2d9b9d0d391cf4dc8e

Author: Harry Youd <harry@harryyoud.co.uk>
Date:   Sun, 27 Aug 2017 21:29:57 +0200

    Recents: Add accessibility descriptions for lock ImageViews

    Change-Id: I09ce342ce135017294f5a4197b7e52dded3fb17e

Author: thecrazyskull <anaskarbila@gmail.com>
Date:   Sat Sep 9 17:03:18 2017 +0200

    SystemUI: locked tasks should have a valid view

    If the view doesn't exist, the card won't be able to receive touch
    events. We need those touch events to have a bounce-back animation
    when trying to swipe away a locked card.

    Change-Id: If7b3c5e5094d2752926eb306dd54264da0ceaa3e

Author: LuK1337 <priv.luk@gmail.com>
Date:   Thu Nov 30 13:15:13 2017 +0100

    SystemUI: Fix title text clipping when task lock button is visible

    Change-Id: I8005360f932c930011d969e2913bc28efb826163

Author: Michael W <baddaemon87@gmail.com>
Date:   Thu, 30 Nov 2017 22:39:00 +0100

    SystemUI: Recents: Improve code for long app titles being overlapped

    * Take all buttons into account when calculating the margin for title
    * Don't check every combination of buttons but just add a margin for
      each of them

    Change-Id: I8e3da14ee00f0d16667866585cceef48ef1348c4

Change-Id: I882f741ba518090202203e4326a5cf7205ebc098