Always fire element set:color and set:opacity event when color and opacity is set (#3761)
Always fire element set:color and set:opacity event when color and opacity is set (#3761)

* Always fire event when color and opacity is set

* Element sprite events always fire when set

Co-authored-by: Steven Yau <c4e01c0f87a9d4bf034f0f681553ace272d52b0f@snapchat.com>
playcanvas/engine,MicroWorldwide/PlayCanvas,MicroWorldwide/PlayCanvas,playcanvas/engine