cli exits if a svelte compiler error occurs

[matthew-ia]

When the svelte compiler throws an error, e.g., an 'unclosed-element' error in the template file, it exists the cayo CLI entirely. It'd be nice if this just let the user know, but kept the server running and continue watching the files.

I think the fix will be something like wrapping the import(...) statements in cayo.js for the template, pages, and cayo components in a try...catch as well as adding some try...catch stuff to renderer and prerender. I fiddled around with it and got it to successfully catch the example error above in the template file, but then there was uncaught errors in renderer (as expected, since template would be undefined if it can't be compiled).

[matthew-ia]

Fixed in 219ad9b (tagging # 54 was a typo)