Adds a closure to be called by the default main loop at regular intervals with millisecond granularity.
func will be called repeatedly every
interval milliseconds until it
ControlFlow::Break. Precise timing is not guaranteed, the timeout may
be delayed by other events. Prefer
timeout_add_seconds when millisecond
precision is not necessary.
The default main loop almost always is the main loop of the main thread. Thus, the closure is called on the main thread.