Dronecraft

fixed mining selectors when selecting a mining area in negative coordinates
enemy drones now de-spawn at day
mining drones now go to there starting y-level before unloading items, so they do not accidentally fly and get stuck inside caves
started work on a dimension for the bossfight. it can only be accessed via command at the moment 
added command to teleport to bossfight dimension. /dronedimension
added command to teleport to overworld dimension /overworldteleport
changed lighting levels of many decoration blocks.