Make PinmameGameLogicEngine.OnInit asynchronous#32

freezy merged 2 commits intoVisualPinball:masterVisualPinball/VisualPinball.Engine.PinMAME:masterfrom

arthurkehrwald:async-gamelogicengine-initarthurkehrwald/VisualPinball.Engine.PinMAME:async-gamelogicengine-initCopy head branch name to clipboard