Replace Vec with EcoVec, removed Box
#2420
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See #2393.
As it turns out, errors are not so cheap to clone and not so rare: delayed errors can create large amounts of
SourceDiagnostics that are cloned in function calls and processed as delayed errors, this means that the extra level of indirection (theBox<..>that used to be surrounding errors inSourceResult<T>) and the expensive cloning (memcpyover the entire contents) were expensive on documents that make use of delayed errors a lot (citations/refs inside oflocate).