ServerMultiplex: Introduces a server mutiplexer

- Also moves all the existing Wemo* stuff over to support the multiplexer
- Moves MainViewController to be the owner of the multiplexer, and its delegate

XIONControlPanel/Models/DeviceProtocol.swift

@@ -0,0 +1,71 @@
+//
+//  DeviceProtocol.swift
+//  XIONControlPanel
+//
+//  Created by James Magahern on 3/13/20.
+//  Copyright © 2020 XION. All rights reserved.
+//
+
+import Foundation
+
+enum DeviceState
+{
+    case off
+    case on
+}
+
+enum DeviceType
+{
+    case `switch`
+}
+
+protocol Device
+{
+    // Read-only properties
+    var name:   String { get }
+    var serial: String { get }
+    var type:   DeviceType { get }
+    
+    // Writable properties
+    var state:  DeviceState { get set }
+}
+
+extension Device where Self: Hashable
+{
+    func hash(into hasher: inout Hasher)
+    {
+        hasher.combine(self.name)
+        hasher.combine(self.type)
+        hasher.combine(self.serial)
+    }
+    
+    static func == (lhs: Self, rhs: Self) -> Bool
+    {
+        return lhs.name == rhs.name && lhs.serial == rhs.serial
+    }
+}
+
+class AnyDevice : Device
+{
+    private var device: Device
+    
+    public var name: String
+        { get { return device.name } }
+    
+    public var serial: String
+        { get { return device.serial } }
+    
+    public var type: DeviceType
+        { get { return device.type } }
+    
+    public var state: DeviceState {
+        get { return device.state }
+        set { device.state = newValue }
+    }
+    
+    init(_ device: Device) {
+        self.device = device
+    }
+}
+
+extension AnyDevice : Hashable {}

XIONControlPanel/Models/WemoDevice.swift

@@ -8,23 +8,12 @@
 
 import Foundation
 
-class WemoDevice: Hashable
+class WemoDevice : Device
 {
-    enum State
-    {
-        case off
-        case on
-    }
-    
-    enum DeviceType
-    {
-        case `switch`
-    }
-    
     var name:   String = ""
     var host:   String = ""
     var model:  String = ""
-    var state:  State = .off
+    var state:  DeviceState = .off
     var type:   DeviceType = .switch
     var serial: String = ""