Revert "Adding C# 8.0 build flavors to prototype with new language features."

This reverts commit 4054bcec72f4d143994966958fab2f7f00016be7.

Ix.NET/Source/Directory.build.targets

@@ -10,9 +10,6 @@
   <PropertyGroup Condition="'$(TargetFramework)' == 'net45'">
     <DefineConstants>$(DefineConstants);NO_ARRAY_EMPTY;NO_TASK_FROMEXCEPTION</DefineConstants>
   </PropertyGroup>
-  <PropertyGroup Condition="'$(Configuration)' == 'Debug_CSharp8' OR '$(Configuration)' == 'Release_CSharp8'">
-    <DefineConstants>$(DefineConstants);CSHARP8</DefineConstants>
-  </PropertyGroup>
 
   <PropertyGroup>
     <Product>$(AssemblyName) ($(TargetFramework))</Product>

Ix.NET/Source/Ix.Async.NET.sln

@@ -1,7 +1,7 @@
 
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio Version 16
-VisualStudioVersion = 16.0.28407.52
+# Visual Studio 15
+VisualStudioVersion = 15.0.26730.3
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "test", "test", "{87534290-A7A6-47A4-9A3A-D0D21A9AD1D4}"
 EndProject
@@ -37,74 +37,40 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "System.Interactive.Async.Pr
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
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 		Debug|Any CPU = Debug|Any CPU
-		Release_CSharp8|Any CPU = Release_CSharp8|Any CPU
 		Release|Any CPU = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
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 	EndGlobalSection

Ix.NET/Source/System.Interactive.Async.Providers.Tests/System.Interactive.Async.Providers.Tests.csproj

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <NoWarn>$(NoWarn);CS0618</NoWarn>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
 

Ix.NET/Source/System.Interactive.Async.Providers/System.Interactive.Async.Providers.csproj

@@ -5,7 +5,6 @@
     <AssemblyTitle>Interactive Extensions - Async Providers Library</AssemblyTitle>
     <TargetFrameworks>net45;net46;netstandard1.4;netstandard2.0</TargetFrameworks>
     <PackageTags>Ix;Interactive;Extensions;Enumerable;Asynchronous</PackageTags>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
   <ItemGroup>

Ix.NET/Source/System.Interactive.Async.Tests/System.Interactive.Async.Tests.csproj

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <NoWarn>$(NoWarn);CS0618</NoWarn>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
 

Ix.NET/Source/System.Interactive.Async/System.Interactive.Async.csproj

@@ -5,7 +5,6 @@
     <AssemblyTitle>Interactive Extensions - Async Library</AssemblyTitle>
     <TargetFrameworks>net45;net46;netstandard1.4;netstandard2.0</TargetFrameworks>
     <PackageTags>Ix;Interactive;Extensions;Enumerable;Asynchronous</PackageTags>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
   <ItemGroup>

Ix.NET/Source/System.Linq.Async.Queryable.Tests/System.Linq.Async.Queryable.Tests.csproj

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <NoWarn>$(NoWarn);CS0618</NoWarn>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
 

Ix.NET/Source/System.Linq.Async.Queryable/System.Linq.Async.Queryable.csproj

@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>net45;net46;netstandard1.4;netstandard2.0</TargetFrameworks>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
   <ItemGroup>

Ix.NET/Source/System.Linq.Async.Tests/System.Linq.Async.Tests.csproj

@@ -3,7 +3,6 @@
   <PropertyGroup>
     <TargetFrameworks>netcoreapp2.1;net461</TargetFrameworks>
     <NoWarn>$(NoWarn);CS0618</NoWarn>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
 

Ix.NET/Source/System.Linq.Async/System.Linq.Async.csproj

@@ -2,7 +2,6 @@
 
   <PropertyGroup>
     <TargetFrameworks>net45;net46;netstandard1.4;netstandard2.0</TargetFrameworks>
-    <Configurations>Debug;Release;Debug_CSharp8;Release_CSharp8</Configurations>
   </PropertyGroup>
 
   <ItemGroup>