Add player:set_sky() with simple skybox support
Add player:override_day_night_ratio() for arbitrarily controlling sunlight brightness
Add additional check to avoid broadcasting private messages in error conditions
Add missing "-" to list of allowed chars in media filenames
Remove noisy error messages, prepend "pathfinder: " to pathfinder messages
Add minetest.kick_player(name, reason)
Add output and success return values to chatcommands