We now implicitly add the margins to GroupBox so that you
can easily add them to a layout.

This also gets rid of the silly Sidebar example and adds a much
more useful Layout tab for effective testing.

Change-Id: I6026c32b2a198062d9b11a67245df0529aa61f8a
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

- Removed contentWidth and contentHeight since it is not needed
- Exposed contentItem so that it can be designable.
- Respect the implicit width or height of the contentItem if it is the
only item of the GroupBox. Otherwise childrenRect is used.
- Modified the style so that the style takes care of only the
padding size and not the entire size of the group box.
- Fixed flat and checkable appearance for custom style

Change-Id: I2c7ec4cb7d5e6f96863847e8d8d6d6f52428364e
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>

They are strictly not needed...
As a consequence of this, do not limit the size of the TextArea

Change-Id: I3c152e7e8f749d7b5b2a0b9887664a11fb7d3b04
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

..than the implicit size of the layout.

Change-Id: I89ad1d91c7e492ba498acd50e2ddde9cc8e84581
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

This makes sure all examples are in a separate directory for the
Qt source packages. It also is in line with how the other repositories
are structured.

Task-number: QTBUG-30886
Change-Id: Idc2856e5dfaf467c8cb9764aee327a3b20c7b2d0
Reviewed-by: Caroline Chao <caroline.chao@digia.com>

The usage of width/height is discouraged. Applications should instead
use Layout.preferredWidth and Layout.preferredHeight

Change-Id: I9fc3af0776319402f3a63244977c17e753bcfcc7
Reviewed-by: Caroline Chao <caroline.chao@digia.com>

Items will be laid sequentially in the grid, either in LeftToRight
mode or TopToBottom mode (depending on the value of the flow property)

Change-Id: Ib080517260ac4519171e77abd533cad3f306f70e
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

Change-Id: I7f2d6c2f85d01fa693cf0e129e7d86d28e417366
Reviewed-by: Frederik Gladhorn <frederik.gladhorn@digia.com>

Now when it is possible to modify the content rect of a GroupBox, we can
finally have a resizable layout in the GroupBox.

Change-Id: I8afc4474c222eda790e52a82de00b5439942efeb
Reviewed-by: Jan Arve Sæther <jan-arve.saether@digia.com>

This makes it more consistent with Grid element, and with the
other properties the GridLayout has (rows,columns,Layout.row...)

Change-Id: I341a806df889a7888ac0466e07d73bb2ea90f5ef
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

..to Layout.fill{Width,Height}

This property now takes a bool, which enables you to write
  Layout.fillWidth: true

instead of
  Layout.horizontalSizePolicy: Layout.Expanding

Change-Id: Icf2e0dc4757938489908b8997d6c4e80c8be1c50
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>

Change-Id: I1655ff789f539ad1c8897562c3d22d2b0d89cb90
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>