The new `XmlReader` which is able to read from several sources#948

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Mingun wants to merge 11 commits intotafia:masterfrom

Mingun:new-reader

Commits on Feb 22, 2026

Implement a high-level XmlReader which is able to parse XML consisted of several XML sources
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Support namespaces in the new XmlReader
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Add a new example which demonstrates the new XmlReader API
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Rename XmlReader to LookaheadReader to avoid name clash in the next commit
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Implement XmlRead for new XmlReader
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Replace SliceReader and IoReader with the implementation that uses the new XmlReader
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Get rid of XmlRead trait, because now it have only one implementation
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Get rid of unused PayloadEvent::DocType and PayloadEvent::GeneralRef
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Get rid of de::resolver module, replace it with reader::resolver
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Add test to ensure, that entities which expands to the XML fragments are parsed
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Merge impl blocks with same bounds
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