Using pattern matching for nulls where applicable, discarded unused lambda parameters, cleaned up some classes. Unignored ServerLog commands which was mistakenly ignored due to a .gitignore rule

src/NadekoBot/Modules/Music/Services/AyuVoiceStateService.cs

@@ -176,7 +176,7 @@ public sealed class AyuVoiceStateService : INService
             }
 
             var current = _voiceProxies.AddOrUpdate(guildId,
-                gid => new VoiceProxy(CreateVoiceGatewayLocal()),
+                _ => new VoiceProxy(CreateVoiceGatewayLocal()),
                 (gid, currentProxy) =>
                 {
                     _ = currentProxy.StopGateway();