The grid position variable is non-private: gridPosition in the PlatformBlock class definition but was used as private: _gridPosition in the onLoad method.
This PR updates the grid position variable in the onLoad to gridPosition.
This adds a platformer tutorial called Ember Quest. I hope I have done a service, because I am tired, lol. I am sure there will be comments. I just want to say, I did my best. I approached this as someone new to Flame, just like I was about 10 months ago. Are there concepts that can be improved, sure. We can always optimize code, but I didn't want any concepts to be super abstract. I had never coded a game before when I began my journey with Flame this year, so things might be a bit simple for experienced game developers, but for myself, I had never even thought about a game loop or animations, etc.
