Added a flag to disable the standard popper.
Added a flag to disable the standard popper.

Signed-off-by: Gianni Valdambrini <c5d749f9a9fad12805bcb3c96e57c90355771f56@develer.com>

develersrl/maliit-demo-qml,develersrl/maliit-demo-qml,develersrl/maliit-demo-qml,develersrl/maliit-demo-qml