Throw an error if any world description fails to parse or typecheck #2306
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Fixes #2304. Previously, any
data/worlds/*.world
which failed to parse or typecheck only generated a warning, which could be viewed in Messages, but could not be seen if loading a single scenario.There is not much use to only display a warning and keep going in such a circumstance; presumably the only time this would happen is if someone is developing a world description, in which case they want to know immediately about any errors. This PR makes such world loading failures into an exception rather than a warning.