Feature Request: Warm Ups and Cool Downs

[AnthonyAMC]

Warm Up:
Once the player enters the portal, he can not exit and will wait the specified duration before the teleport happens.
-> Value is false
OR
Teleport is canceled if the player leaves the portal (cuboid) within the specified duration.
-> Value is true

 /portal warmup <name> <true/false> <duration> <message>

Cool Down:
Player can not leave the portal (cuboid) for the specified duration.

 /portal cooldown <name> <duration> <message>