C++ Qt Game Tutorial 23 - Implementing the Button Class (Part 1)

We start implementing the Button class. Along the way we review signals and slots, learn about two new events (hoverEnterEvent and hoverLeaveEvent), and for the first time, make our very own signal :), exciting stuff :P Code for tutorial 23 & 24: https://github.com/MeLikeyCode/QtGameTutorial/tree/master/tutorial23