Add user mode to hide idle time #22
Description
Displaying idle time leaks information about the client's activity (unless they run an anti-idle script), making it easier to stalk or harass them. Other ircds have a user mode that hides idle times, and such a mode would be helpful in this case.
Similar to #16, there are several ways to approach this; perhaps the most flexible is for the connection class to determine whether the client can set such a mode.