minor reformatting of boundsIncludingChildren function
fixing boundsIncludingChildrenNoShadow function
fixing rendering of shadow: was previously causing a vast area of the screen to become damaged
added a comment to let the Inspector "streak" if needed
destroys must be followed by nullification, because too many times the assumption is that a destroyed object is set to null when in fact it's not...
adding a pattern "x = x.destroy()" so x is automatically set to null