disable multitargeting + TreatWarningsAsErrors to for fast development

Directory.Build.props

@@ -29,10 +29,12 @@
     <SuppressNETCoreSdkPreviewMessage>true</SuppressNETCoreSdkPreviewMessage>
   </PropertyGroup>
 
+  <!--
   <PropertyGroup Condition="'$(Configuration)' == 'Release'">
     <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
-  
+  -->
+
   <!--TODO: Check what this is testing for and why does it fail?-->
   <PropertyGroup Condition="'$(Configuration)' == 'Debug'">
     <CheckForOverflowUnderflow>false</CheckForOverflowUnderflow>

src/ImageSharp.Drawing/ImageSharp.Drawing.csproj

@@ -8,7 +8,12 @@
     <PackageId>SixLabors.ImageSharp.Drawing</PackageId>
     <PackageTags>Image Draw Shape Path Font</PackageTags>
     <RootNamespace>SixLabors.ImageSharp</RootNamespace>
+
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+
+    <!--
     <TargetFrameworks>netcoreapp2.1;netstandard1.3;netstandard2.0</TargetFrameworks>
+    -->
   </PropertyGroup>
 
   <ItemGroup>

src/ImageSharp/ImageSharp.csproj

@@ -10,7 +10,10 @@
     <VersionPrefix Condition="$(packageversion) != ''">$(packageversion)</VersionPrefix>
     <VersionPrefix Condition="$(packageversion) == ''">0.0.1</VersionPrefix>
 
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <!--
     <TargetFrameworks>netcoreapp2.1;netstandard1.3;netstandard2.0;net472</TargetFrameworks>
+    -->
 
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <GenerateDocumentationFile>true</GenerateDocumentationFile>

tests/ImageSharp.Tests/ImageSharp.Tests.csproj

@@ -2,7 +2,10 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <!--
     <TargetFrameworks>netcoreapp2.1;net462;net472</TargetFrameworks>
+    -->
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
     <LangVersion>latest</LangVersion>
     <DebugType Condition="$(codecov) != ''">full</DebugType>