Added coal-related block placements: coal places a coal block embedded on fire (usually), coal block places a shaft of coal ore straight down to bedrock. That does not mean it doesn't go through lava, remember!
Added sapling spawning tree, does not yet do custom tree types or giants, does place a dirt block. If the tree can't spawn it won't. Works in a cool somewhat derpy way, I consider this good. Can be made to act normal with care.