Notes:
	Bug from last time:  Silly!

So NOW can we build a tower?
	Sure, no problem
	But the texture coordinates aren't there yet

How about stairs?
	We'll have to set the effective floor
	Quick trick function for that

Not-in-class adjustments (pull out improved demo):
	I added strafe
		James already did it in lab, but now it's in the main version
	Threads are actually wrapped up
		shutdown flag and join
	FPS and such should now be in the GUI
		With Dear ImGUI
	Height and width are queried from glfw
		glViewport needs to be called
		Initial call is probably during setup somewhere
	ImGUI is set up, but not really used yet
		escape will free the mouse so we can use the menu
		I wanted to set it up ahead of time
		Shall we have a demo of how to use it?
			Let's display FPS instead of dumping it to the console
			Maybe some other stuff too, like player position
	engine.h contains everything that's all the way global
		key_status, player position, etc.
		Non-thread-safe general buffer
	StoneBlock inherits from GameObject
		GameObject will contain general functions like init_from_object
		Requires draw and movement to be goverridden