Refactor the SidebarView list into its own View so to reduce code duplication

Multiplatform/Shared/Sidebar/CompactSidebarContainerView.swift

@@ -0,0 +1,37 @@
+//
+//  CompactNavigationView.swift
+//  Multiplatform iOS
+//
+//  Created by Stuart Breckenridge on 29/6/20.
+//  Copyright © 2020 Ranchero Software. All rights reserved.
+//
+
+import SwiftUI
+
+struct CompactSidebarContainerView: View {
+    
+	@EnvironmentObject private var sceneModel: SceneModel
+	@StateObject private var sidebarModel = SidebarModel()
+	
+	var body: some View {
+		SidebarView()
+			.environmentObject(sidebarModel)
+			.navigationBarTitle(Text("Feeds"))
+			.listStyle(PlainListStyle())
+			.onAppear {
+				sceneModel.sidebarModel = sidebarModel
+				sidebarModel.delegate = sceneModel
+				sidebarModel.rebuildSidebarItems()
+			}
+
+	}
+	
+	
+}
+
+struct CompactSidebarContainerView_Previews: PreviewProvider {
+    static var previews: some View {
+        CompactSidebarContainerView()
+			.environmentObject(SceneModel())
+    }
+}