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/Modules/Gambling/Common/Events/GameStatusEvent.cs

@@ -13,7 +13,7 @@ using System.Threading;
 using System.Threading.Tasks;
 using Serilog;
 
-namespace NadekoBot.Core.Modules.Gambling.Common.Events
+namespace NadekoBot.Modules.Gambling.Common.Events
 {
     public class GameStatusEvent : ICurrencyEvent
     {