FallGates - Ground Portals

This update adds configurable settings to the config.yml file to allow server administrators to modify the general behavior of the falls. This new update allows admins to configure:

• The time to wait before closing an open fall.
• The height of the fall (i.e., the number of blocks to allow the player to fall before teleporting him to the connected fall).
• The vertical and horizontal push forces applied to the players when they leave the target fall.