- Database namespace is now NadekoBot.Db

- Db related code is now in src/NadekoBot/Db
- Finished major part of the db refactor, but many optimizations are left to be made

src/NadekoBot/Db/Models/PlaylistSong.cs

@@ -0,0 +1,19 @@
+namespace NadekoBot.Core.Services.Database.Models
+{
+    public class PlaylistSong : DbEntity
+    {
+        public string Provider { get; set; }
+        public MusicType ProviderType { get; set; }
+        public string Title { get; set; }
+        public string Uri { get; set; }
+        public string Query { get; set; }
+    }
+
+    public enum MusicType
+    {
+        Radio,
+        YouTube,
+        Local,
+        Soundcloud
+    }
+}