refactor: add display.Pin interface #749
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This PR is to add a
display.Pin
interface and use it everywhere that is easy to do so.Related to work in PR #742 this is intended to help disconnect the drivers repo even more from the
machine
package.The remaining drivers that use
machine.Pin
directly have various complications such as changing the pin config from input to output and back, which will have to be addressed in some different way.