Make it obvious what platforms are supported by QtSensors.

Also, this brings the front page layout somewhat further
in line with qtlocation & qtconnectivity API docs.

Change-Id: I5e54ae388892dcb2a806c4775828abcdc81eb79d
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Simplify building of simulator based code

There is no need for the CONFIG+=simulator logic anymore.
qtHaveModule() is an automatic way of doing the same.

Change-Id: Ibe87abb93e036a82fae3a752d9886c58ccebeec1
Reviewed-by: Rainer Keller <rainer.keller@digia.com>
Reviewed-by: Alex Blasche <alexander.blasche@digia.com>
BlackBerry: update plugin key

The plugin key for both the Generic backend and the BlackBerry backend
were set to "notused". This ultimately caused the Generic backend not
to be loaded, which is why QTiltSensor wasn't being exposed. The duplicate
keys caused a collision in a QMap in QFactoryLoader, making it look
like the generic backend had been created, when it hadn't.

Tested on a BlackBerry Z10.

Change-Id: Ie5e40586751e7c3b9683a94a39b07efd4fc7fc82
Reviewed-by: Bernd Weimer <bweimer@blackberry.com>
Reviewed-by: Fabian Bumberger <fbumberger@rim.com>