Removing Event class. Changed Window::PollEvents
glfwPollEvents() polls all events for all windows. No need to call it for each window, so it's now a static method. If a user wants to stop windows from polling any events there will be an API for freezing/unfreezing event handling.

Event class was removed, it's irrelevant. Bakge internally handles window and input events, users just have to respond to and configure the EventHandler interface funcs.