Missing updateInstanceDelay

[Chazzman]

I believe that:

open var pulseInterval: TimeInterval = 0

ought to be:

open var pulseInterval: TimeInterval = 0 { didSet { updateInstanceDelay() } }

When starting and then restarting a pulsator, the experience is different on the second and successive runs than the first.
Came across this when setting pulseInterval after setting numPulse and animationDuration