Finished level 5 & 6 Added more mechanics

I have finished 5 & 6. I have added the gravity mechanic and everything
works fine but need to think of a better way to check it. Also I have
started on getting wall sliding working properly. I might have a look at
making my own physics material and having the floor overlap all of the
walls so that it doesn't mess up the normal movement I will talk to
Chris to see if he has any ideas on it.