feat: implement retreiving widgets

- display a bottom sheet with widgets
- open widgets in a browser
- fixes in .gitignore
- Windows UWP build files

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

lib/pages/chat/widgets_bottom_sheet.dart

@@ -0,0 +1,38 @@
+import 'package:flutter/material.dart';
+
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:matrix/matrix.dart';
+import 'package:url_launcher/link.dart';
+
+class WidgetsBottomSheet extends StatelessWidget {
+  final Room room;
+
+  const WidgetsBottomSheet({Key? key, required this.room}) : super(key: key);
+  @override
+  Widget build(BuildContext context) {
+    return ListView.builder(
+      shrinkWrap: true,
+      itemBuilder: (context, index) {
+        if (index == room.widgets.length) {
+          return ListTile(
+            title: Text(L10n.of(context)!.integrationsNotImplemented),
+            leading: const Icon(Icons.info),
+          );
+        }
+        final widget = room.widgets[index];
+        return Link(
+          builder: (context, callback) {
+            return ListTile(
+              title: Text(widget.name),
+              subtitle: Text(widget.type),
+              onTap: callback,
+            );
+          },
+          target: LinkTarget.blank,
+          uri: Uri.parse(widget.url),
+        );
+      },
+      itemCount: room.widgets.length + 1,
+    );
+  }
+}