fix: Long load times

Profiled the application and noticed that even though we're not awaiting
the AddMessageCallback() it's still getting the UI thread stuck.
Marshalling this to another thread since the class is thread-safe
anyway.

closes #31
closes #32

Author: ProgrammingByPermutation

src/TwitchStreamingTools/ViewModels/Pages/ChatViewModel.cs

@@ -3,6 +3,7 @@
 using System.Linq;
 using System.Reactive;
 using System.Speech.Synthesis;
+using System.Threading.Tasks;
 
 using Nullinside.Api.Common.Twitch;
 
@@ -176,7 +177,7 @@ public override void OnLoaded() {
       }
 
       _selectedTwitchChatNames.Add(channel.TwitchChannel);
-      _twitchClient.AddMessageCallback(channel.TwitchChannel, OnChatMessage);
+      Task.Run(() => _twitchClient.AddMessageCallback(channel.TwitchChannel, OnChatMessage));
     }
   }