Add blue screen of death for WASM crashes
When there is a known common WASM crash, we should indicate it visibly.  Memory out of bounds errors seem to be quite common in my development so far.  If there were other common ones we could handle those as well.  I'm happy to work on this if we could agree on wording and visual style.

Mockup

![Screen Shot 2021-12-26 at 4 05 40 PM](https://user-images.githubusercontent.com/6473/147420100-6d8793e0-4e71-4eef-a7df-25f559c631e3.png)
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