adding logic.cpp to the object list in lib/prototype/CMakeLists.txt
World::getObjectsRef returns reference and not a copy of the vector of objects
Logic::adjustObject logic fix about the x,y coordinates
Loop::run prints FPS and has internal slowDown with sleep
Object members: x,y are now float and not int, which rounds down the values at each adjustment step
Timer refactor, function names reflect better the intent
typo fix in Widget::keyPressEvent, passing unhandled event to parent QWidget instead of an endless loop