vector-im/element-ios/issues/5114 - Poll creation screen

- added input toolbar poll creation action.
- reordered input toolbar actions as per designs.
- added multiline text field and extracted common components.

RiotSwiftUI/Modules/Common/Util/SafeBindingCollectionEnumerator.swift

@@ -0,0 +1,40 @@
+// 
+// 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
+
+/**
+ Used to avoid crashes when enumerating through bindings in the AnswerOptions ForEach
+ https://stackoverflow.com/q/65375372
+ Replace with Swift 5.5 bindings enumerator later.
+ */
+@available(iOS 14.0, *)
+struct SafeBindingCollectionEnumerator<T: RandomAccessCollection & MutableCollection, C: View>: View {
+    
+    typealias BoundElement = Binding<T.Element>
+    private let binding: BoundElement
+    private let content: (BoundElement) -> C
+    
+    init(_ binding: Binding<T>, index: T.Index, @ViewBuilder content: @escaping (BoundElement) -> C) {
+        self.content = content
+        self.binding = .init(get: { binding.wrappedValue[index] },
+                             set: { binding.wrappedValue[index] = $0 })
+    }
+    
+    var body: some View {
+        content(binding)
+    }
+}