Added MCP23018 class with support for Pullup on Output#105

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totalretribution wants to merge 4 commits intoadafruit:masterfrom

totalretribution:MCP23X18

Commits on Mar 7, 2025

Added MCP23018 class with support for OUTPUT_PULLUP in pinMode.
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Commits on Mar 10, 2025

Commits on Mar 11, 2025

Removed whitespace.
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