SystemUI: Berry styles

Author: Joey <joey@lineageos.org>
Date:   Thu Dec 28 20:28:01 2017 +0100

    systemui: introduce berry styles

    Change-Id: I61d0861112ae9b25db20b8d5e57d2a5f8a26b833
    Signed-off-by: Harry Youd <harry@harryyoud.co.uk>
    Signed-off-by: Joey <joey@lineageos.org>

Author: Joey <joey@lineageos.org>
Date:   Fri Mar 9 22:49:01 2018 +0100

    base: update UiManager's night mode according to berry state

    Change-Id: I2eb43f1760e95246b81e487f420f42550ef3ddcd
    Signed-off-by: Joey <joey@lineageos.org>

Author: Joey <joey@lineageos.org>
Date:   Thu Jul 5 21:14:01 2018 +0200

    systemUi: styles: support more dark overlays

    Change-Id: I4fafa2b1e342608e2690c3dda7cb06aaf88247ba
    Signed-off-by: Joey <joey@lineageos.org>

Change-Id: Ia75685e4f44ecd22e781a32d06a2a5c885b559ed