Test for collision with walls
The last change was only testing for the collisions with the outer boundaries, this one tests for inner wall collisions
Jumping added and works okay, want to be able to see player move fractional amounts though
Fractional moving of screen isn't quite working right.
Smooth scrolling works but need more intelligent collision testing
Keys are working better, but collision has lots of problems
Walking is broken, but am sliding down left walls but not right ones.
Walking and collisions look better, but jumping is broken.
jumping and moving is working reasonably, but  I feel like there ought to be better way- maybe don't use floating point, everything needs to be more discrete.  The player shouldn't be constantly falling into the ground and colliding, it should just be known that they are on the ground and no gravity is necessary.
Using tile for graphics, need to make it black in background because transparency doesn't come through (or need to use image() differently).  The graphics need to look blockier, don't use 32x32 tiles, 8x8 or 16x16 at most.  Need to remember to rescale them so they aren't interpolated by processing.
Replacing block player with image player.