✨ Implement connection selector

- Ability to Add/Modify/Delete connections

lib/main.dart

@@ -2,6 +2,7 @@ import 'dart:convert';
 import 'dart:math';
 
 import 'package:flutter/material.dart';
+import 'package:gomix_flutter/connection_selector.dart';
 import 'package:gomix_flutter/mixer_state.dart' as mixer;
 import 'package:gomix_flutter/mixing_tab.dart';
 import 'package:gomix_flutter/ports_tab.dart';
@@ -176,7 +177,12 @@ class _GoMixHomeState extends State<GoMixHome> {
                       context: context,
                       builder: (BuildContext context) => AlertDialog(
                         title: const Text('Select Instance'),
-                        content: const Text("WIP"),
+                        content: ConnectionSelector(
+                            prefs: prefs,
+                            initWs: initWs,
+                            connections: (jsonDecode(
+                                    prefs.getString("connections") ?? "{}"))
+                                as Map<String, dynamic>),
                         actions: <Widget>[
                           TextButton(
                             onPressed: () => Navigator.pop(context, 'Cancel'),