Change long extensions namespace

Author: darklinkpower

source/Common/FlowHttp/Events/DownloadProgressArgs.cs

@@ -1,5 +1,4 @@
-using PluginsCommon.Extensions;
-using System;
+using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;

source/Common/PluginsCommon/Extensions/LongExtensions.cs

@@ -4,7 +4,7 @@
 using System.Text;
 using System.Threading.Tasks;
 
-namespace PluginsCommon.Extensions
+namespace System
 {
     public static class LongExtensions
     {

source/Library/JastUsaLibrary/JastUsaLibrary.cs

@@ -27,7 +27,6 @@
 using JastUsaLibrary.ProgramsHelper;
 using PlayniteUtilitiesCommon;
 using System.Threading;
-using PluginsCommon.Extensions;
 
 namespace JastUsaLibrary
 {