Cleanup the Itemviews examples
- use nullptr instead 0
- use for loop instead foreach
- include own header first
- remove uselss includes
Change-Id: I32e9f64356e42038707d063dcad977239ce1fe9e
Reviewed-by: Luca Beldi <v.ronin@yahoo.it>
Reviewed-by: Sze Howe Koh <szehowe.koh@gmail.com>