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Header only read - #46
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Extract MxCh data-assignment logic from ReadChunk into a shared ProcessDataChunk helper, and add ReadObjectData which seeks to a single object's MxSt block and reads only its data chunks. This enables loading animation/audio data by object ID without reading the entire interleaved file.
Replace ReadObjectData with a simpler ReadObject(FileBase*, slot) that seeks to the MxSt at the given slot index and reuses ReadChunk to parse the full object tree and data chunks. HeaderOnly mode reads just the RIFF header, MxHd, and MxOf offset table, then stops - enabling callers to defer per-object reads.
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HeaderOnlymode reads just the RIFF header, MxHd, and MxOf offset table, then stops - enabling callers to defer per-object reads usingReadObject. This is useful if you are not interested in reading through the whole file but want targeted extraction of known objects.