soft errors / errors with results

Makes the error manager available to renderers so they can addError without failing the render.  The only time this makes sense so far is for svgOMG which now will report exactly one such error due to bevel & emboss use on a .svg layer.

This points at a new svgOMG commit that includes that error reporting.

I added a script so that there is a clear/consistent way to update the npm-shrinkwrap.