JS: add a helper to calculate the event time in ticks a delay would wake up at
JS: add a helper to calculate the event time in ticks a delay would wake up at

Signed-off-by: Harvey Harrison <eadbd6b462bf3c97df0300a934c12bc2e5d1fe51@ausenco.com>

jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim,jaamsim/jaamsim