Prepare I2C module for adding slave mode#241
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I'm working on adding support for I2C slave mode. A type parameter to identify which mode the peripheral is in will be added to `Enabled` (as opposed to `I2C`; the mode is only important if the peripheral is enabled, and anything else would make implementing methods that are always available, if the peripheral is enabled, more complex than need be). I think with this new mode parameter in the mix, it is no longer obviously better to have a default value for the state parameter. With default type parameters, there's always a trade-off between brevity and convenience on one side, and clarity on the other. While master mode will certainly be more common, I think the brevity/convenience gained by using it as the default will not be worth the loss of clarity. This is not a clear-cut decision and I don't feel strongly about it. I'm open to changing this and making enabled/master the new default.
I'm about to add another module for I2C slave mode which is going to need access to `Error`. Leaving it were it is right now would introduce a circular dependency.
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I'm currently working on I2C slave mode. Since that might still take a bit more time (it's currently not working) and since it looks like I might be adding more error handling code on the master side to debug it, I figured I'd submit this now, to at least get some of it reviewed, and to keep any merging and rebasing on my side to a minimum.