Remove Starscream and migrate to native classes for the WS-RPC client…

… for finer-granularity error handling.

Package.swift

@@ -49,10 +49,6 @@ let package = Package(
             url: "https://github.com/GigaBitcoin/secp256k1.swift.git",
             .upToNextMinor(from: "0.4.0")
         ),
-        .package(
-            url: "https://github.com/daltoniam/Starscream.git",
-            .upToNextMinor(from: "4.0.4")
-        ),
         .package(
             url: "https://github.com/SwiftyBeaver/SwiftyBeaver.git",
             .upToNextMajor(from: "1.9.0")
@@ -71,7 +67,6 @@ let package = Package(
                 "BigInt",
                 "KeychainAccess",
                 "secp256k1",
-                "Starscream",
                 "SwiftyBeaver"
             ],
             resources: [

Sources/SubVTData/Model/API/RPC.swift

@@ -1,3 +1,4 @@
+import Foundation
 /**
  Generic RPC request.
  */
@@ -103,9 +104,11 @@ struct RPCBackendErrorResponse: Codable {
 /**
  RPC error body inner error data.
  */
-struct RPCBackendError: Codable {
+struct RPCBackendError: Codable, Error, CustomStringConvertible, LocalizedError {
     let code: Int
     let message: String
+    var description: String { self.message }
+    var errorDescription: String { self.message }
 
     private enum CodingKeys: String, CodingKey {
         case code

Sources/SubVTData/Model/Substrate/AccountId.swift

@@ -65,8 +65,8 @@ public struct AccountId: CustomStringConvertible, Hashable {
         checksumData.append(addressData as Data)
         let hash = try Blake2.hash(.b2b, size: blake2bMaxLength, data: checksumData as Data)
         addressData.append(hash.subdata(in: 0..<checksumLength))
-        let bytes = Array(addressData as Data)
-        return Base58.base58Encode(bytes)
+        let addressBytes = Array(addressData as Data)
+        return Base58.base58Encode(addressBytes)
     }
 }