Add GUI (#7)

* Create a dummy WPF project

* Set up Ammy placeholders

* Don't track autogenerated files

* Basic layout

* Add Program.cs

* Implement basic workflow

* Autofocus token textbox and add Enter key handler

* Strip double quotes from token

* AmmyUI converters are slightly dumb :(

* Use CanExecute

* Add file path select and theme select, also refactor

* Persist token

* Trying to improve UI/UX - 1

* Rename stuff

* Finish improving UI/UX

* Remove data placeholder

* Remove border on middle grid

* Ok now i'm done

* Improve Discord API layer

* Add lots of stuff

* Show filesizes in export

* Improve export

* Animations

* Update readme

* Improving gui again

* Improve UI again

* Refactor

DiscordChatExporter/Models/ChannelChatLog.cs

@@ -0,0 +1,21 @@
+using System.Collections.Generic;
+using System.Linq;
+
+namespace DiscordChatExporter.Models
+{
+    public class ChannelChatLog
+    {
+        public Guild Guild { get; }
+
+        public Channel Channel { get; }
+
+        public IReadOnlyList<Message> Messages { get; }
+
+        public ChannelChatLog(Guild guild, Channel channel, IEnumerable<Message> messages)
+        {
+            Guild = guild;
+            Channel = channel;
+            Messages = messages.ToArray();
+        }
+    }
+}