Clean up dependencies, update to embedded-hal digital v2 API #1
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This is only used once when `new` is called. The caller should do that by themselves if needed, but it is quite reasonable to use the keypad without it, calling poll() at strategic points. Also remove dependencies: * cortex_m is not needed at all * embedded_hal was only needed for the counter Also fix a small typo in Cargo.toml.
Since the errors from pins are usually not very useful, I opted to throw the details away, avoiding more associated types etc.
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The first commit removes the need to pass a counter which is only used once, and some unused dependencies.
The second commit makes the keypad work with the embedded-hal digital::v2 API by allowing read and write to return errors.
If you find these changes to be useful, I have more ideas in mind, such as passing an optional Enum for keys names, and keeping track of press/release events.