Add forward to get arena info from elsewhere.
Change competitor ADT array to normal array.

It's easier if these requests act as point-in-time snapshots, and an ADT
array hinders that goal.
Remove size limits on arena name for functions.
Make necessary changes to disabling arena.

b246a7a032eb8561c5fcbf7c333f9b0c2c934d91 removed in-between statuses in
favor of having the last command being stored with arena info. This
commit makes the resulting necessary changes in the plugin file.