Add educational activities to GCompris (In Qt Quick)

GCompris is a high quality educational software suite that aims to develop children’s skills and knowledge while playing very entertaining mini-games. GCompris was firstly developed in Gtk+ and lately ported to Qt. However, there are still several activities which are not yet available in the current version and need to be written from scratch. Activities like Paint, or Photo Hunter were loved by children and they miss them in this version. My goal is to port as many activities as I can, while keeping the quality up to the high expectation.