Doc: Make Stack attached properties more visible

And use \qmlattachedproperty instead of \qmlproperty for
properties in the Stack.

Change-Id: I1ffbd84ce91fd5a9040c082a8bcb403589becf91
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Several improvements to documentation

* List all applicable attached properties for each layout
* Move the stuff that describes min,pref and max sizes from GridLayout
  to the Layout docs.
* Document that all layouts \inherits Item. (Even if they don't directly
  inherit, this is consistent with how the positioners are documented)
* Add some links to Row, Column and Grid where appropriate
* Use \qmlattachedproperty instead of \qmlproperty for the attached
  properties. (Again, consistent with how the Positioners attached
  properties are documented)
* Change POSITIVE_INFINITE to the correct POSITIVE_INFINITY

Change-Id: Ia9272faa479b48a97300b031402c0380ca113d7b
Reviewed-by: Caroline Chao <caroline.chao@digia.com>
Reviewed-by: Jerome Pasion <jerome.pasion@digia.com>
Styles docs: fix the styleData -tables

Change-Id: I75fb45d3f6b7b93f5758bd1664f9ff674a492772
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>
Fix missing margins and incorrect size for ToolBar and StatusBar

Using the implicitHeight of an item makes ToolBar and StatusBar
a lot more useable with layouts. In addition we enable the padding
property from the style, allowing its content to be positioned
in a more convenient way. This is similar to how we already do it
for GroupBox.

Change-Id: Ia2aa1bcb9ae109718fd752401400222adec242ac
Reviewed-by: Gabriel de Dietrich <gabriel.dedietrich@digia.com>
Cleaning up some examples and removing clutter

We want to use more layouts in our examples as it is the
recommended way to create tool bars etc.

Change-Id: Ib3b1e8e907cc5277d522557a19d2c294a7d251b1
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
TabViewStyle: expose styleData.availableWidth

Change-Id: Ib209ec7311c64f172718c8baa7d7f63f6f79a3a8
Reviewed-by: Jens Bache-Wiig <jens.bache-wiig@digia.com>