iframes and PlayCanvas

Variant Launch SDK currently does not work when running in an iframe, as it needs full access to the parent window object.

Some hosting solutions use iframes by default, such as PlayCanvas hosted projects.

When sharing published builds hosted on playcanvas, add /e to the start of the URL path to avoid using iframes, which will stop Variant Launch from working. For example if your build address is https://playcanv.as/p/AOYF3YyG/ use https://playcanv.as/e/p/AOYF3YyG/