Android: add support for extracting RotateDrawable

The rotation attributes are required for implementing BusyIndicator.

Task-number: QTBUG-39215
Change-Id: Ief51bf921f61b3b030f26d377b4bfd13913af6c1
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Android: extract progressBarStyle(Small|Large)

The indeterminate drawable is used for QtQuick Controls BusyIndicator

Task-number: QTBUG-35081
Change-Id: Iecdc6e80444b5134ec1fa61916c7ac1612cd275f
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Android: extract SeekBar_thumbOffset

Task-number: QTBUG-39215
Change-Id: I2a7b878b1a86280c92a445826f196de3245fd4e2
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Android: ensure unique IDs when extracting style data for layers

Indeterminate progress drawables can consist of multiple layers that
don't necessarily have an ID. Ensure that the extracted file names
contains unique IDs to avoid extracted layers overwriting each other.

Task-number: QTBUG-35081
Change-Id: I3dc48bf363510ded9b955aa51fa479c607541169
Reviewed-by: BogDan Vatra <bogdan@kde.org>
Use accurate title/status bar gradient colors on OS X.

QMacStyle now uses proper system colors when drawing status bars.

Change-Id: I618e485a2a68a484f7c8cb5635cd2bf529126c02
Reviewed-by: Morten Johan Sørvig <morten.sorvig@digia.com>