Makes it harder to change global defaults later.

Used to be done by Qt-components.

Used for all kinds of notifications

Hardly see any use, operating system should offer method for
minimizing applications.

Signed-off-by: Herman van Hazendonk <github.com@herrie.org>

-Remove support for Maemo, Meego, Harmattan & Symbian.
-Allow definition of font for QMake.
Signed-off-by: Herman van Hazendonk <github.com@herrie.org>

The scrolling code was just scrolling at most one line at a time, and even when
the touch point moved even just one pixel.

Fix that by using the font size as a scale factor (that's still not 100%
correct, but it improves the situation, and the bias scales well with changing
font size) and by actually accumulating not consumed offsets, so small moves
(smaller than the font size) are not discarded, but actually accumulate.

MNotification is no longer maintained.

mimeData always null if clipboard is empty

- the Key element doesn't have a MouseArea anymore (this would lead to the creation of many mouseareas), gestures and vkb-presses are all handled in one MouseArea.
- the scroll/select/gestures event filter system has been partially rewritten as the old one would only work in one fixed orientation.

- affects user command strings read from menu.xml