initial port of QML components to QtQuick2

this is an initial port of the qml component set of okular to qtquick2

it's straightforward, except pageitem that right now is a qquickpainteditem, that works fine, but a bit slower than generating and uploading the textures by hand (that may be an eventual future port)

the okular active application is still missing, but the components can be used from anywhere in qml
REVIEW:121326