Log the time periods each player was watched

[n-aspen]

Log the time periods in unix milliseconds each player was watched
Print the times to a file on command

Example scenario using 3 players

Player A logs in at 12:05
Player A logs out at 12:13
Player A logs in at 12:18
Player A logs out at 12:25
Player B logs in at 12:27
Player C logs in at 12:30
Player B log out at 12:52
Command is run at 1:00
Player C logs out at 1:07

The log would contain
Player A 12:05 -> 12:13
Player A 12:18 -> 12:25
Player B 12:27 -> 12:52
Player C 12:52 -> 1:00