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/Music/Common/Impl/CachableTrackData.cs

@@ -1,7 +1,7 @@
 using System;
 using System.Text.Json.Serialization;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed class CachableTrackData : ICachableTrackData
     {

src/NadekoBot/Modules/Music/Common/Impl/MultimediaTimer.cs

@@ -2,7 +2,7 @@
 using System.Runtime.InteropServices;
 using Serilog;
 
-namespace NadekoBot.Core.Modules.Music.Common
+namespace NadekoBot.Modules.Music.Common
 {
     public sealed class MultimediaTimer : IDisposable
     {

src/NadekoBot/Modules/Music/Common/Impl/MusicExtensions.cs

@@ -2,7 +2,7 @@
 using Discord;
 using NadekoBot.Extensions;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public static class MusicExtensions
     {

src/NadekoBot/Modules/Music/Common/Impl/MusicPlatform.cs

@@ -1,4 +1,4 @@
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public enum MusicPlatform
     {

src/NadekoBot/Modules/Music/Common/Impl/MusicPlayer.cs

@@ -10,13 +10,13 @@ using System.Threading;
 using System.Threading.Tasks;
 using Ayu.Discord.Voice;
 using NadekoBot.Common;
-using NadekoBot.Core.Modules.Music.Common;
+using NadekoBot.Modules.Music.Common;
 using NadekoBot.Core.Services.Database.Models;
 using NadekoBot.Extensions;
 using NadekoBot.Modules.Music;
 using Serilog;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed class MusicPlayer : IMusicPlayer
     {

src/NadekoBot/Modules/Music/Common/Impl/MusicQueue.cs

@@ -4,7 +4,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed partial class MusicQueue
     {

src/NadekoBot/Modules/Music/Common/Impl/RedisTrackCacher.cs

@@ -8,7 +8,7 @@ using System.Threading.Tasks;
 using Serilog;
 using StackExchange.Redis;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed class RedisTrackCacher : ITrackCacher
     {

src/NadekoBot/Modules/Music/Common/Impl/RemoteTrackInfo.cs

@@ -2,7 +2,7 @@
 using System;
 using System.Threading.Tasks;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed class RemoteTrackInfo : ITrackInfo
     {

src/NadekoBot/Modules/Music/Common/Impl/SimpleTrackInfo.cs

@@ -2,7 +2,7 @@
 using System;
 using System.Threading.Tasks;
 
-namespace NadekoBot.Core.Modules.Music
+namespace NadekoBot.Modules.Music
 {
     public sealed class SimpleTrackInfo : ITrackInfo
     {