updated lighting so it doesn't pass through blocks, it's a bit slow though. gave sky a light level of 8. added gradual day/night. added feature to increase/decrease world brightness. added main menu. added some animated blocks like fire and chests, they are slow though.
also removed some old block sprites and such.
Shadows are not properly implemented yet and are treated as full blocks.
Block physics are also pretty rough right now, I added code so that a block placement/update can update other blocks on all sides of it, but this currently can cause a RAM clear
added player movement, characters
added lava, logs, leaves, planks, and some other blocks,
added culling so the renderer pretty much only renders the blocks that will be visible
