Add theming support, and support for other top level configuration to swiftui views with VectorHostingViewController, VectorContentModifier. Add VisibilityModifier. Move from List to VStack.

Riot/Modules/Room/NotificationSettings/SwiftUI/FormSectionHeader.swift

@@ -1,44 +0,0 @@
-// 
-// Copyright 2021 New Vector Ltd
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-// http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-//
-
-import SwiftUI
-
-@available(iOS 13.0, *)
-struct FormSectionHeader: View {
-    
-    @Environment(\.theme) var theme: Theme
-    var text: String
-    
-    var body: some View {
-        Text(text)
-            .foregroundColor(Color(theme.textSecondaryColor))
-            .padding(.top)
-            .font(Font(theme.fonts.footnote))
-    }
-}
-
-@available(iOS 13.0, *)
-struct FormSectionHeader_Previews: PreviewProvider {
-    static var previews: some View {
-        List {
-            SwiftUI.Section(header: FormSectionHeader(text: "Section Header")) {
-                Text("Item 1")
-                Text("Item 2")
-                Text("Item 3")
-            }
-        }.listStyle(GroupedListStyle())
-    }
-}