17.13 Tumble racing

Tumble racing is a form of racing in which the participants may only tumble.
You race from a point the immortal running the event picks, to another point He
or She picks. Points will be awarded by the immortal based on how quickly or
what order you arrive.

JOIN TUMBLERACE
  - Joins a Tumble Race once one has been announced.

TUMBLE <direction>
  - Lets you tumble in a direction.

TUMBLERACE RESULTS
  - Shows you who is winning.

QUIT TUMBLERACE
  - Quit the Tumble Race.