Add support for reading back values of ON/OFF states #12
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Hi, first off thank you for your library it is very useful.
While building something with it I realised it might be helpful to read back the current state of the ON/OFF states. So this PR adds this functionality to the library. I added a couple methods matching the setters and also added tests for them.
I do have pretty much no experience with the bitfiddly bits of rust programming though, so if anything needs improvement I'll gladly adjust the code :)