Massive cleanup

- Removed GuildConfigs repository, moved to extensions
- Moved StreamSettings extension to GuildConfig extensions
- namespace NadekoBot.Core has been simplified to NadekoBot in many places (more to come)
- Replaced some raw delete queries with simple linqtodb queries

src/NadekoBot/Services/Database/Repositories/IRepository.cs

@@ -1,21 +1,11 @@
 using System.Collections.Generic;
 using NadekoBot.Core.Services.Database.Models;
+using NadekoBot.Services.Database.Models;
 
-namespace NadekoBot.Core.Services.Database.Repositories
+namespace NadekoBot.Services.Database.Repositories
 {
     public interface IRepository<T> where T : DbEntity
     {
-        T GetById(int id);
-        IEnumerable<T> GetAll();
-
         void Add(T obj);
-        void AddRange(params T[] objs);
-
-        void Remove(int id);
-        void Remove(T obj);
-        void RemoveRange(params T[] objs);
-
-        void Update(T obj);
-        void UpdateRange(params T[] objs);
     }
 }