Add Efl.Model.Composite.Boolean, a model for wrapping another Efl.Model and
adding boolean properties to its children.
Children of the given composite model will have the boolean properties
specified in Efl.Model.Composite.Boolean with the specified default value.
A call to Efl.Model.Property_set can change the property value for a child.
Signed-off-by: Cedric BAIL <cedric@osg.samsung.com>