Pocket Integration

[pabelnl]

Includes:

• PocketNetworkClient: Public class that conforms to the NetworkClient protocol, adding the necessary steps and information to interact with the Pocket Network.

• Carthage dependency: Added pocket-swift-core-carthage to the carfile, necessary to use all the core functionalities for Pocket.

• Updated Project: Added necessary frameworks to the carthage script section and to the test target copy files to properly run the tests.

[keefertaylor]

Can you provide the commands you're using to build? Running integration tests in Xcode gives me:

The bundle “IntegrationTests” couldn’t be loaded because it is damaged or missing necessary resources. Try reinstalling the bundle.
2019-10-15 20:41:32.976364-0400 xctest[28938:2344211] (dlopen_preflight(/Users/keefertaylor/Library/Developer/Xcode/DerivedData/TezosKit-azhwkmvjudwqolgugmsphxlkimqx/Build/Products/Debug-iphonesimulator/IntegrationTests.xctest/IntegrationTests): Library not loaded: @rpath/RNCryptor.framework/RNCryptor
  Referenced from: /Users/keefertaylor/Library/Developer/Xcode/DerivedData/TezosKit-azhwkmvjudwqolgugmsphxlkimqx/Build/Products/Debug-iphonesimulator/TezosKit.framework/Frameworks/PocketSwift.framework/PocketSwift
  Reason: no suitable image found.  Did find:
	/Users/keefertaylor/Library/Developer/Xcode/DerivedData/TezosKit-azhwkmvjudwqolgugmsphxlkimqx/Build/Products/Debug-iphonesimulator/TezosKit.framework/Frameworks/PocketSwift.framework/Frameworks/RNCryptor.framework/RNCryptor: no matching architecture in universal wrapper)

I also have some failures in PocketNetwork unit tests.

[keefertaylor]

Thank you for taking the time to contribute to TezosKit. This PR overall looks great.

Here are a few notes that I think will help this integration remain easy to maintain and make it easy for clients to use. I don't feel incredibly strongly about these things, and I'm happy to take this PR as is if you'd rather not implement.

---

If you'd like, I'd be supportive of you adding an extension to TezosNodeClient to automatically make a NodeClient with the Pocket network attached. You could place in /Pocket/TezosNodeClient+Pocket and implement with:

extension PocketNetworkClient {
  public static pocketNetworkNodeClient() -> PocketNetworkClient {
    let pocketNEtworkClient = PocketNetworkClient(...)
    return new TezosNodeClient(networkClient: pocketNetworkClient, ....) 
  }
}

(You could also use a convenience initializer if you prefer to the static factory method.

---

If you'd like to have integration tests, you can feel free to add them. I run integration tests manually on merge.

[keefertaylor]

Here are the commands and resulting log files:

Unit Tests:

$ set -o pipefail && xcodebuild test -scheme TezosKit -destination 'platform=iOS Simulator,name=iPhone 8,OS=13.0' ONLY_ACTIVE_ARCH=YES | xcpretty

Output: https://gist.github.com/keefertaylor/717bbea39a9e788e049da0397019953f

---

Integration Tests:

$ set -o pipefail && xcodebuild test -scheme IntegrationTests -destination 'platform=iOS Simulator,name=iPhone 8,OS=13.0' ONLY_ACTIVE_ARCH=YES | xcpretty

Output: https://gist.github.com/keefertaylor/c4db31c1b82b535476064afd08ed491c