Implements MIKMIDIConnectionManager (Issue #106)

[armadsen]

@cflesner and @johndpope I'd very much appreciate your feedback on this before I merge it. The major relevant API is in https://github.com/mixedinkey-opensource/MIKMIDI/blob/Issue106/Source/MIKMIDIConnectionManager.h

Implements Issue #106.

[johndpope]

I love your work. Will test this out over weekend. Thanks

[kris2point0]

It looks great to me. The only thing I don't necessarily like is that the saved configurations rely on the class name not ever changing. I think simply exposing -userDefaultsConfigurationKey for subclasses to be able to override would be sufficient for resolving that though.

[armadsen]

Nice catch, Chris. Perhaps, I'll use [MIKMIDIConnectionManager class]. I don't want subclassing to break obvious things, but then again, I'm not sure I really designed MIKMIDIConnectionManager with the explicit intention of encouraging subclasses, and name already lets you customize userDefaultsConfigurationKey.

Actually, I should have read my own code ;). -userDefaultsConfigurationKey only depends on [self class] if name is not set (or empty), which is considered invalid, really. name is a nonnull argument to the designated initializer. So I think I'm just going to leave it as-is for now. I did add a warning that name can't be nil/empty to the documentation.

[kris2point0]

Okay, I missed that too :)

That was my only concern, and since that was a non-issue, I'd say I give the pull request a 👍🏻