Info on coroutines need update
In the latest manual ([https://www.lexaloffle.com/pico8_manual.txt](https://www.lexaloffle.com/pico8_manual.txt)):
`coresume` returns a bool value, and can take additional parameters as the coroutine's parameters.
`costatus` now returns one of three string value: `"running"`,`"suspended"`,`"dead"`

Copied from official manual for convenience
> 	:: Coroutines
	
		Coroutines offer a way to run different parts of a program in a somewhat concurrent 
		way, similar to threads. A function can be called as a coroutine, suspended with 
		yield() any number of times, and then resumed again at the same point.
		
			function hey()
				print("doing something")
				yield()
				print("doing the next thing")
				yield()
				print("finished")
			end
			
			c = cocreate(hey)
			for i=1,3 do coresume(c) end
		
		
		cocreate f
		
			Create a coroutine for function f.
			

		coresume c [p0 p1 ..]
		
			Run or continue the coroutine c. Parameters p0, p1.. are passed to the
			coroutine's function.
			
			Returns true if the coroutine completes without any errors
			Returns false, error_message if there is an error.
			
			** Runtime errors that occur inside coroutines do not cause the program
			to stop running. It is a good idea to wrap coresume() inside an assert().
			If the assert fails, it will print the error message generated by 
			coresume.
			
			assert(coresume(c))


		costatus c
		
			Return the status of coroutine c as a string:
				"running"
				"suspended"
				"dead"
		
		yield
			
			Suspend execution and return to the caller.