Allow DeviceInfo to use native Go types

[daniel-sullivan]

Inspired by #30

This originally come from the requirement to have a consistent device ID which can be stored as a string (for example in a UI select box) and then be used to select the same device later.

[gen2brain]

Thanks. I don't like including C and header file just for a few constants, is it really needed?

[daniel-sullivan]

Completely agree! Unfortunately, not including it results in:

../../constants.go:10:10: could not determine what C.ma_bool32 refers to

unless the header is included in the same file.

I tried to maintain the existing format (with constants being in constants.go)

There's a couple of alternates if you prefer:

• I could move the ma_true and ma_false definitions into device_info.go where the header's already included
• Change the line newDevice.IsDefault = device.isDefault == True to newDevice.IsDefault = device.isDefault == C.ma_true

[gen2brain]

Is ma_bool32 really needed? These are just 1 and 0.

[daniel-sullivan]

Not really. If you're happy hardcoding to those, that makes everything a lot simpler. I've just had upstream libraries I'm wrapping screw around with values you expect to be constant so I'm fairly defensive.

[gen2brain]

Yes please, that will never change I guess, so hardcoding is fine.

[daniel-sullivan]

Just for cross-linking, this PR should also fix #28