[+] optimization in the /flat command (with more detail in the config)

[+] modification of the config (more detail)

[+] command : /flat <length> <width> <block>: allows to have the specified block with the given dimensions

[+] command /dropper : Place blocks (3x3) with a water source on the blocks and the player is teleported to them and must land in the water source

[+] addition of detail in the file of config.yml