Configurable token exipration

[osvein]

Server administrators should be able to decide for how long player locations and tp tokens are valid.

Instead of being hardcoded

private final long cooldown = 86400 * 1000; // Milliseconds
private Integer max_tpback = 1440; // Number of MINUTES to keep

these values should be read from a configuration file.

[FloydATC]

Hmm I think the value must be clamped to 1440 minutes for the time being because of the hh:mm syntax which considers any time BEFORE the current time to be TODAY and any time AFTER the current time to be YESTERDAY. We need to carefully consider the possible effects of allowing an admin to track less than 1440 minutes (24 hours) of movement. Also, extending the scope without introducing an RRD mechanism may cause excessive memory use. Example, maybe just keep 5 minute resolution for up to a week back, hourly resolution for up to a month and maybe daily resolution for longer than that. At that point, the usefulness is questionable ofcourse.

[osvein]

How about the expiration of teleport requests, grants and denials?