Use xcconfig for app display name, for both app and share extension

RiotShareExtension/SupportingFiles/ShareExtension-Debug.xcconfig

@@ -0,0 +1,21 @@
+// 
+// Copyright 2020 Vector Creations 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.
+//
+
+// Configuration settings file format documentation can be found at:
+// https://help.apple.com/xcode/#/dev745c5c974
+
+#include "Config/Common.xcconfig"
+#include "Pods/Target Support Files/Pods-RiotPods-RiotShareExtension/Pods-RiotPods-RiotShareExtension.debug.xcconfig"