Remove the QWidget compositor example

The QWidget API isn't well fit for a Wayland compositor, and does
not have any advantage over a QWindow, which can also draw using
QPainter. Besides the current implementation doesn't work properly,
and no one seems to be interested in fixing it.

Change-Id: Id1c337506af48e1d1fdd8d14f0ed637d299702f3
Reviewed-by: Laszlo Agocs <laszlo.agocs@digia.com>
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Add a note that qmake CONFIG+= only works in a clean tree

You need to use qmake -r on a tree which already has Makefiles. But you
probably need to clean up anyway in order to get the new functionality, so
this is a good recommendation for the general case.

Change-Id: Ie0fa10621a3fe961945da10a72e7fcc632f3fc0f
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Keyboard: Correctly read the xkb locked state

Fixes a typo when reading the xkb states

Change-Id: Ie5acdbcff188049683b503ba8fc8f58c693eb102
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>
Null check for window on pointer_axis

The window is already destroyed and server doesn't get a message yet.

Change-Id: Ia9dd0ce891a712d1aa913fcb3313a5fe300788ab
Reviewed-by: Giulio Camuffo <giulio.camuffo@jollamobile.com>
Reviewed-by: Robin Burchell <robin+qt@viroteck.net>
build fix for MODULE_PLUGINS_TYPE

Change-Id: I8d44f50480440060eba84354e88fb2535e1d8e4a
Reviewed-by: Jørgen Lind <jorgen.lind@digia.com>