mgv7: Implement getGroundLevelAtPoint(), fix layer of topnodes at chunk Y boundaries, remove growGrass()

Fix health bar overlap when a larger texture is used

Remove old Makefile

Swing the camera down when the player lands on the ground, based on the velocity the surface is hit with.

Improvements to get_all_craft_recipes (see api doc)

fix warnings for pathfinder debug traces

cleanup useless code

fix minor glitches too