HW Back button: Fixed after merge with 5.2 stable.

Change-Id: I3253b116747124d67ccd63396a3fe710d0d1d96d
Reviewed-by: Jarosław Staniek <staniek@kde.org>
Reviewed-by: Tomasz Olszak <olszak.tomasz@gmail.com>
Tizen: Added screen orientation handling in xcb plugin.

X Window events sent by Window Manager are used.

Change-Id: I06970059a003326ddda94cf07d8822f14af5cadc
Reviewed-by: Jarosław Staniek <staniek@kde.org>
Reviewed-by: Tomasz Olszak <olszak.tomasz@gmail.com>