SCI: Improve detection and reporting of resource errors

Simple assertions in the resource manager are not sufficient to
track down resource corruption issues, and some error conditions
that were being checked already were either ignored or only raised
as warnings that casual users would be unlikely to see.

Ideally, error handling in ResourceManager would be improved to
the point where errors would correctly propagate out of it (so the
warning dialogue could be displayed from outside), but right now
error codes are dropped all over the place, and it would take more
effort to fix that without much benefit for the current situation.
If/until someone has the energy to fix that, the warning dialogue
is simply shown from ResourceManager::scanNewSources.

Refs Trac#9764.

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