Emit an error instead of a warning when a file has multiple root level model, actor or light elements #619
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Summary
#433 and #444 made it so that only one root level model, actor or light can be contained in an SDFormat file. So as to not break existing behavior, only a warning was issued if more than one is found. These have now been converted to errors. This PR also removes deprecated functions for accessing multiple model, actor or light elements from
sdf::Root
.Checklist
codecheck
passed (See contributing)Note to maintainers: Remember to use Squash-Merge