Module timers

Support for timers.

Timers are just a bunch of callbacks sorted by expiry date.

Structs

• Timer
  Timer is a handle to the timer system that allows triggering a callback to be called after a specified period of time.
• TimerList
  TimerList provides the interface to the event loop for activating times and determining the nearest timeout.

Enums

• TimerMode
  The TimerMode specifies what should happen after the timer fired.