JS: add getWorkingTime method to StateEntity
JS: add getWorkingTime method to StateEntity

Prepare to remove getWorkingHours method

Signed-off-by: Harry King <4297d713059dfdc9fd310cd85bf547ea21a2d624@ausenco.com>
Signed-off-by: Stephen Wong <6f34db11dd2258ec4ffa799eb0d7827f906cb1c6@ausenco.com>

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