Remove system.threading dependency

Author: Atlinx

GDTask.csproj

@@ -3,10 +3,6 @@
     <TargetFramework>net472</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="System.Threading.Tasks.Extensions" Version="4.5.4" />
-  </ItemGroup>
-  <ItemGroup>
-    <Folder Include="addons\GDTask\CompilerServices\" />
     <Folder Include="tests\manual\" />
   </ItemGroup>
 </Project>

addons/GDTask/CompilerServices/AsyncMethodBuilderAttribute.cs

@@ -0,0 +1,15 @@
+#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
+#pragma warning disable CS0436
+
+namespace System.Runtime.CompilerServices
+{
+    internal sealed class AsyncMethodBuilderAttribute : Attribute
+    {
+        public Type BuilderType { get; }
+
+        public AsyncMethodBuilderAttribute(Type builderType)
+        {
+            BuilderType = builderType;
+        }
+    }
+}

results.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" ?>
+<testsuites failures="0" name="TestXML" tests="1" time="3.519">
+	<testsuite name="GDTaskTests" failures="0"  tests="1" time="0">
+		<testcase name="TODO Make Tests" time="0"></testcase>
+	</testsuite>
+
+</testsuites>