gpio: add dynamic pin support and conversion functions #20
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This adds the basic outline functionality for the GPIO module and will form the base for follow-up PRs (see #19, #20, #21) to round out the GPIO functionality. The gpio module is largely based on/copied from the implementation in [stm32h7xx-hal](https://github.com/stm32-rs/stm32h7xx-hal).
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The version check failing is addressed by #25 |
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This implements SPI Master mode for Full duplex, half duplex and simplex transfers. All transmit operations are tested properly, and full duplex transfers looped back to itself (MISO, MOSI connected together) are tested. It also implements the SpiBus and SpiDevice embedded-hal traits, as demonstrated by the examples. Notably, the SpiDevice trait doesn't currently support delays. This will be addressed in a follow on PR, as will slave operation.
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This is taken directly from the implementation in stm32h7xx-hal.