Added option to enable queued spawner registering. This can improve server performance when players are loading chunks on your server. (This options might cause spawner registering delays, meaning players might see holograms of their spawners few seconds later if they just teleported to an unloaded chunk with the spawner nearby)
(If you find any issues please make sure you report them)

Fixed negated ground and environment requirements not working correctly.
Fixed spawner parsing from SpawnerMeta.
Fixed warning hologram not showing.
Fixed ignored natural spawner breaking.