Adds getting/sending messages

kordophone2/Models.swift

@@ -36,6 +36,40 @@ enum Display
             self.messagePreview = messagePreview
         }
     }
+    
+    struct Message: Identifiable
+    {
+        let id: String
+        let sender: Sender
+        let text: String
+        
+        var isFromMe: Bool {
+            if case .me = sender { true }
+            else { false }
+        }
+
+        init(from m: Serialized.Message) {
+            self.id = m.guid
+            self.text = m.text
+            self.sender = if m.sender == "(Me)" {
+                .me
+            } else {
+                .counterpart(m.sender)
+            }
+        }
+        
+        init(id: String = UUID().uuidString, sender: Sender = .me, text: String) {
+            self.id = id
+            self.sender = sender
+            self.text = text
+        }
+        
+        enum Sender
+        {
+            case me
+            case counterpart(String)
+        }
+    }
 }
 
 enum Serialized
@@ -70,4 +104,26 @@ enum Serialized
             self.date = dt
         }
     }
+
+    struct Message: Decodable
+    {
+        let guid: String
+        let sender: String
+        let text: String
+        let date: Date
+
+        init?(xpc dict: xpc_object_t)
+        {
+            guard let g: String = dict["id"] else { return nil }
+
+            let s: String = dict["sender"] ?? ""
+            let t: String = dict["text"] ?? ""
+            let d: Date = dict["date"] ?? Date(timeIntervalSince1970: 0)
+
+            self.guid = g
+            self.sender = s
+            self.text = t
+            self.date = d
+        }
+    }
 }