Capture local and global labels for methods

[tjarratt]

When a protocol has a method whose argument labels differ between the caller and the callee, we need to capture both of these and include both in the generated code (otherwise the protocol adherence will fail).

Given this protocol

protocol DoesStuffWithLabels {
  func loadCurrentUserInfo(completionBlock completion: SomeBlockType)
}

We generate this incorrect code

class FakeDoesStuffWithLabels {
// snip
  func loadCurrentUserInfo(completion: SomeBlockType) {
  // omitted for brevity
  }
//snip
}

[tjarratt]

Fixed by 2771050.

brew update && brew upgrade fake4swift if you want to see this behavior locally.