Remove support for obsolete framework versions (#400)

* Remove support for obsolete framework versions

- Removes support for .NET 4.5.2 and .NET Core 2.1. The oldest frameworks explicitly targeted are .NET 4.6.2 and .NET Core 3.1
- Enables testing against .NET 6.0
- Updates some dependencies (Application Insights, Newtonsoft JSON, and some system packages)

Fixes issue #399

* Convert HealthReporterBuster project

Adopt SDK style and migrate to .NET 4.7.1

* Use "dotnet build" instead of "msbuild" in scripts

* Use Pegasus directly

* Do not test .NET 5.0 anymore

It will be out of support in early May 2022

* Increase timeout for one of the ETW tests

* Update nuget.exe binary

* Update Elasticsearch version

* Update ApplicationInsights dependency

Warsaw.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.30804.86
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.32002.185
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Core", "Core", "{FC86C736-6428-431B-B83F-940BF7182757}"
 EndProject
@@ -53,7 +53,7 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Diagnostics.Event
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Diagnostics.EventFlow.ServiceFabric", "src\Microsoft.Diagnostics.EventFlow.ServiceFabric\Microsoft.Diagnostics.EventFlow.ServiceFabric.csproj", "{E988D6E6-5DC2-4FED-9AD6-3B2B5EF2BD58}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster", "test\Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster\Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster.csproj", "{242D4BE6-4CA8-4288-8843-65DF84BBBD3E}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster", "test\Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster\Microsoft.Diagnostics.EventFlow.FunctionalTests.HealthReporterBuster.csproj", "{242D4BE6-4CA8-4288-8843-65DF84BBBD3E}"
 	ProjectSection(ProjectDependencies) = postProject
 		{F1EF768D-9E8B-42D5-B0E1-C7EF2270C245} = {F1EF768D-9E8B-42D5-B0E1-C7EF2270C245}
 	EndProjectSection

src/Microsoft.Diagnostics.EventFlow.Consumers.SimpleBenchmark/Microsoft.Diagnostics.EventFlow.Consumers.SimpleBenchmark.csproj

@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net4.6</TargetFramework>
+    <TargetFramework>net462</TargetFramework>
     <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
   </PropertyGroup>
 

src/Microsoft.Diagnostics.EventFlow.Core/Implementations/DateTimePrecise.cs

@@ -4,15 +4,15 @@
 // ------------------------------------------------------------
 
 using System;
-#if NET461 || NET471
+#if NET462 || NET471
 using System.Runtime.InteropServices;
 #endif
 
 namespace Microsoft.Diagnostics.EventFlow
 {
     public static class DateTimePrecise
     {
-#if NET461 || NET471
+#if NET462 || NET471
         [DllImport("Kernel32.dll", CallingConvention = CallingConvention.Winapi)]
         private static extern void GetSystemTimePreciseAsFileTime(out long filetime);
 
@@ -25,7 +25,7 @@ public static DateTime UtcNow
         {
             get
             {
-#if NET461 || NET471
+#if NET462 || NET471
                 if (UseSystemTimePrecise)
                 {
                     GetSystemTimePreciseAsFileTime(out var filetime);

src/Microsoft.Diagnostics.EventFlow.Core/Implementations/HealthReporters/CsvHealthReporter.cs

@@ -15,7 +15,7 @@
 using Microsoft.Extensions.Configuration;
 using Validation;
 
-#if NET452
+#if NET462
 using System.Web;
 #else
 using System.Reflection;
@@ -534,7 +534,7 @@ private void ProcessLogFileFolder()
             }
 
             string basePath;
-#if NET452
+#if NET462
             if (HttpContext.Current != null && HttpContext.Current.Server != null)
             {
                 basePath = HttpContext.Current.Server.MapPath("~/App_Data");

src/Microsoft.Diagnostics.EventFlow.Core/Implementations/JsonConverters/IPEndpointConverter.cs

@@ -16,7 +16,7 @@ internal class IPEndpointConverter : JsonConverter
     {
         public override bool CanConvert(Type objectType)
         {
-#if NET452 || NETSTANDARD1_6
+#if NETSTANDARD1_6
             return typeof(EndPoint).GetTypeInfo().IsAssignableFrom(objectType);
 #else
             return typeof(EndPoint).IsAssignableFrom(objectType);

src/Microsoft.Diagnostics.EventFlow.Core/Implementations/JsonConverters/MemberInfoConverter.cs

@@ -9,14 +9,14 @@
 
 namespace Microsoft.Diagnostics.EventFlow.JsonConverters
 {
-#if NET461 || NET471 || NETSTANDARD2_0
+#if NET462 || NET471 || NETSTANDARD2_0
     public class MemberInfoConverter : JsonConverter<MemberInfo>
 #else
     public class MemberInfoConverter : JsonConverter
 #endif
     {
 
-#if NET452 || NETSTANDARD1_6
+#if NETSTANDARD1_6
         public override bool CanConvert(Type objectType)
         {
             return typeof(MemberInfo).GetTypeInfo().IsAssignableFrom(objectType);
@@ -33,7 +33,7 @@ public override void WriteJson(JsonWriter writer, object value, JsonSerializer s
         }
 #endif
 
-#if NET461 || NET471 || NETSTANDARD2_0
+#if NET462 || NET471 || NETSTANDARD2_0
         public override MemberInfo ReadJson(JsonReader reader, Type objectType, MemberInfo existingValue, bool hasExistingValue, JsonSerializer serializer)
 #else
         public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
@@ -42,7 +42,7 @@ public override object ReadJson(JsonReader reader, Type objectType, object exist
             throw new NotImplementedException();
         }
 
-#if NET461 || NET471 || NETSTANDARD2_0
+#if NET462 || NET471 || NETSTANDARD2_0
         public override void WriteJson(JsonWriter writer, MemberInfo value, JsonSerializer serializer)
 #else
         public void WriteJson(JsonWriter writer, MemberInfo value, JsonSerializer serializer)