Fix missing inclusion of libraries in graphdrawing examples#1335

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hansonchar wants to merge 6 commits intopgf-tikz:masterfrom

hansonchar:gd-trees

Commits on May 31, 2024

Fix missing inclusion of three libraries in one
hansonchar
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Commits on Jun 6, 2024

Commits on Jun 7, 2024

Fix mis-spelled Kellermann to Kellerman based on the
hansonchar
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Commits on Jun 8, 2024

Code format changes based on review feedback
hansonchar
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Commits on Jun 24, 2024

Fix preamble + Nicer and more consistent formatting
hansonchar
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