Activate implicit usings

Author: Bart Koelman

Directory.Build.props

@@ -10,6 +10,7 @@
     <CodeAnalysisRuleSet>$(MSBuildThisFileDirectory)CodingGuidelines.ruleset</CodeAnalysisRuleSet>
     <WarningLevel>9999</WarningLevel>
     <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
     <IsPackable>false</IsPackable>
     <WarnOnPackingNonPackableProject>false</WarnOnPackingNonPackableProject>
   </PropertyGroup>

benchmarks/Deserialization/DeserializationBenchmarkBase.cs

@@ -1,5 +1,3 @@
-using System;
-using System.Collections.Generic;
 using System.ComponentModel.Design;
 using System.Text.Json;
 using JetBrains.Annotations;

benchmarks/Deserialization/OperationsDeserializationBenchmarks.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Text.Json;
 using BenchmarkDotNet.Attributes;
 using JsonApiDotNetCore.Configuration;

benchmarks/Deserialization/ResourceDeserializationBenchmarks.cs

@@ -1,4 +1,3 @@
-using System;
 using System.Text.Json;
 using BenchmarkDotNet.Attributes;
 using JsonApiDotNetCore.Configuration;

benchmarks/QueryString/QueryStringParserBenchmarks.cs

@@ -1,4 +1,3 @@
-using System;
 using System.ComponentModel.Design;
 using BenchmarkDotNet.Attributes;
 using JsonApiDotNetCore;

benchmarks/Serialization/OperationsSerializationBenchmarks.cs

@@ -1,5 +1,3 @@
-using System;
-using System.Collections.Generic;
 using System.Text.Json;
 using BenchmarkDotNet.Attributes;
 using JsonApiDotNetCore.Configuration;

benchmarks/Serialization/ResourceSerializationBenchmarks.cs

@@ -1,5 +1,3 @@
-using System;
-using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Text.Json;
 using BenchmarkDotNet.Attributes;

benchmarks/Serialization/SerializationBenchmarkBase.cs

@@ -1,10 +1,6 @@
-using System;
-using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Text.Json;
 using System.Text.Json.Serialization;
-using System.Threading;
-using System.Threading.Tasks;
 using JetBrains.Annotations;
 using JsonApiDotNetCore.Configuration;
 using JsonApiDotNetCore.Middleware;

src/Examples/GettingStarted/Models/Person.cs

@@ -1,4 +1,3 @@
-using System.Collections.Generic;
 using JetBrains.Annotations;
 using JsonApiDotNetCore.Resources;
 using JsonApiDotNetCore.Resources.Annotations;

src/Examples/GettingStarted/Program.cs

@@ -1,6 +1,3 @@
-using Microsoft.AspNetCore.Hosting;
-using Microsoft.Extensions.Hosting;
-
 namespace GettingStarted
 {
     internal static class Program