Create file-owned headers after storage is selected but before streaming starts. Let owner-backed streamers use that header directly, and keep owned_header_ exclusively for ownerless streamers.
Generated with the assistance of an AI coding tool.
Fixes builds with newer GCC/libstdc++ that no longer provide <cstdint>,
<cstring>, <cfloat>, <memory>, <algorithm> etc. transitively. Also
disambiguates visit<> calls in taxonomy.h with the full namespace and
casts the character value in IfcCharacterDecoder to uint32_t to silence
ambiguous overload warnings.
Thomas Krijnen