Add method to rename immutable profile

Passepartout/Sources/Model/ConnectionProfile.swift

@@ -43,6 +43,8 @@ protocol ConnectionProfile: class, EndpointDataSource {
     var requiresCredentials: Bool { get }
     
     func generate(from configuration: TunnelKitProvider.Configuration, preferences: Preferences) throws -> TunnelKitProvider.Configuration
+
+    func with(newId: String) -> ConnectionProfile
 }
 
 extension ConnectionProfile {

Passepartout/Sources/Model/ConnectionService.swift

@@ -489,7 +489,7 @@ private class PlaceholderConnectionProfile: ConnectionProfile {
     
     let id: String
     
-    var username: String?
+    var username: String? = nil
     
     var requiresCredentials: Bool = false
     
@@ -497,6 +497,10 @@ private class PlaceholderConnectionProfile: ConnectionProfile {
         fatalError("Generating configuration from a PlaceholderConnectionProfile")
     }
     
+    func with(newId: String) -> ConnectionProfile {
+        return PlaceholderConnectionProfile(ConnectionService.ProfileKey(context, newId))
+    }
+
     var mainAddress: String = ""
     
     var addresses: [String] = []

Passepartout/Sources/Model/Profiles/HostConnectionProfile.swift

@@ -65,6 +65,13 @@ class HostConnectionProfile: ConnectionProfile, Codable, Equatable {
 
         return builder.build()
     }
+    
+    func with(newId: String) -> ConnectionProfile {
+        let profile = HostConnectionProfile(title: newId, hostname: hostname)
+        profile.username = username
+        profile.parameters = parameters
+        return profile
+    }
 }
 
 extension HostConnectionProfile {

Passepartout/Sources/Model/Profiles/ProviderConnectionProfile.swift

@@ -139,6 +139,10 @@ class ProviderConnectionProfile: ConnectionProfile, Codable, Equatable {
         }
         return builder.build()
     }
+
+    func with(newId: String) -> ConnectionProfile {
+        fatalError("Cannot rename a ProviderConnectionProfile")
+    }
 }
 
 extension ProviderConnectionProfile {