PDFBOX-5283: ignore dublicate object keys when correcting xRefs#129

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Schmidor wants to merge 4 commits intoapache:trunkfrom

Schmidor:PDFBOX-5283

Commits on Sep 24, 2021

PDFBOX-5283: irgnore wrong object number in lenient mode
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Commits on Oct 5, 2021

only replace xRef with corrected entries, if the original entry was not valid
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Commits on Oct 6, 2021

HashSet instead of HashMap for valid keys
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Commits on Mar 10, 2022

read pointers before replacing
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