add development warnings for missing data properties #320
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This makes a start on #13 — it introduces
dev: true
as an option for adding development warnings, and kicks things off by throwing an error if a template references a property that isn't present on the initial data object (something we can't know until runtime).We can iterate on the specifics of the error message (e.g. it could include a link to some documentation explaining what the message means, and that you can fix it my initialising with null data), but at least now we have something to work with, and the infrastructure to test it