[#797] Clone when setting Vector props (#826)
[#797] Clone when setting Vector props (#826)

Closes #797

## Changes:

- Clone when setting Vector props on Actor
excaliburjs/Excalibur,htalat/Excalibur,htalat/Excalibur,excaliburjs/Excalibur,htalat/Excalibur,excaliburjs/Excalibur