feat: modules gpio.Button and gpio.Switch #112
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This brings the first "useful" feature to the project. See #6 for some discussions about the technique to use to manipulate the GPIO pins. I came up with an approach that allows to potentially use any of the discussed solutions within the model and make it configurable.
For now, there is only one such backend implemented, which is memory mapping
dev/mem
.pkg/module/gpio/gpio.go
implements the general modulespkg/module/gpio/devmem.go
implements the backendCloses #6