Add recording selector

As a proof of concept some widgets were seperated. The home screen now
links to this instead of the recording editor.

lib/widgets/person_text.dart

@@ -0,0 +1,26 @@
+import 'package:flutter/material.dart';
+
+import '../backend.dart';
+import '../database.dart';
+
+class PersonText extends StatelessWidget {
+  final int personId;
+
+  PersonText(this.personId);
+
+  @override
+  Widget build(BuildContext context) {
+    final backend = Backend.of(context);
+
+    return StreamBuilder<Person>(
+      stream: backend.db.personById(personId).watchSingle(),
+      builder: (context, snapshot) {
+        if (snapshot.hasData) {
+          return Text('${snapshot.data.firstName} ${snapshot.data.lastName}');
+        } else {
+          return Container();
+        }
+      },
+    );
+  }
+}