Add iOS Simulator support via Mac helper app

[KingOfBrian]

I'd really love to add Core Bluetooth support to the simulator. It should be pretty straight forward to do by relaying the commands and callbacks over an HTTP socket to a mac process running locally. The API's are identical even if the performance and error conditions are a bit different.

From an implementation PoV, this is basically a mock central manager that talks to a mac app instead of the in-memory simulation.