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

DesignKit/Source/AvatarSize.swift

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+// 
+// 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 Foundation
+import UIKit
+
+// Figma Avatar Sizes: https://www.figma.com/file/X4XTH9iS2KGJ2wFKDqkyed/Compound?node-id=1258%3A19678
+public enum AvatarSize: Int {
+    case xxSmall = 16
+    case xSmall = 32
+    case small = 36
+    case medium = 42
+    case large = 44
+    case xLarge = 52
+    case xxLarge = 80
+}
+
+extension AvatarSize {
+    public var size: CGSize {
+        return CGSize(width: self.rawValue, height: self.rawValue)
+    }
+}