Add renderer config that disables expressions

[mbasaglia]

This adds a setting that disables expressions (they are kept enabled by default). This is to add some security when you don't want animations to run javascript on your page.

Passing something like this to loadAnimation() will ensure expressions are not executed:

    {
        container: document.getElementById('lottie_container'),
        renderer: 'svg',
        loop: true,
        autoplay: true,
        animationData: data,
        rendererSettings: {
            runExpressions: false,
        }
    }

[elizabethsjudd]

I'm turning on this setting based on feedback from our security team. Is there any way to verify this is not using eval()? I still see in our build a warning that eval was detected.

[mbasaglia]

It's still in the code but this setting is read before the expression is evaluated.