Improve error message handling for theme loading failures #5073
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The error messages for a theme that failed to be deserialized (or otherwise failed to load) were covered up by the context/with_context calls:
With these changes, we let the TOML deserializer errors bubble up, so the error messages can now say the line number of a duplicated key - and that key's name - when a theme fails to load because of a duplicated key.
Providing a theme which does not exist to :theme still gives a helpful error message: "No such file or directory."
See #5043