refactored bot-api regarding meters and xyz. added blockAt api.
refactored bot-api regarding meters and xyz. added blockAt api.

crazy2be/mineflayer,crazy2be/mineflayer,crazy2be/mineflayer,PrismarineJS/mineflayer,andrewrk/mineflayer,gnomesley/mineflayer,crazy2be/mineflayer