Fix PresentationBuilder resource leak#25

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Lotes wants to merge 7 commits intoOpenXmlDev:vNextfrom

Commits on Jan 22, 2020

Merge Himanshu's fix into the repository: https://github.com/EricWhiteDev/Open-Xml-PowerTools/pull/15/files
Andrei Atanasiu
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Merged PR 5933: Merge Himanshu's fix into the repository:
Andrei Atanasiu
committed

Commits on Jun 30, 2020

Dispose opened stream
Markus Rudolph
committed

Commits on Jul 2, 2020

Fix similar bugs
Markus Rudolph
committed
Closed further leaks
Markus Rudolph
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Dont need
Markus Rudolph
committed
Dont need
Markus Rudolph
committed