Sort selected target frameworks to avoid warnings

Sort TargetFrameworks in the following projects with net20 first,
to avoid warnings from CUETools.CTDB.EACPlugin:
  CUETools.AccurateRip, CUETools.CDImage, CUETools.CTDB,
  CUETools.CTDB.Types, CUETools.Codecs, CUETools.Parity
Change order:
  <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
  ->
  <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>

- Fixes the following warnings after opening CUETools.sln
  in Visual Studio, e.g.:
  The referenced project 'CUETools.AccurateRip' is targeting a higher
  framework version (4.7) than this project’s current target framework
  version (2.0). This may lead to build failures if types from
  assemblies outside this project’s target framework are used by any
  project in the dependency chain. Project: CUETools.CTDB.EACPlugin

CUETools.AccurateRip/CUETools.AccurateRip.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.AccurateRip</AssemblyName>
     <RootNamespace>CUETools.AccurateRip</RootNamespace>

CUETools.CDImage/CUETools.CDImage.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.CDImage</AssemblyName>
     <RootNamespace>CUETools.CDImage</RootNamespace>

CUETools.CTDB.Types/CUETools.CTDB.Types.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.CTDB.Types</AssemblyName>
     <RootNamespace>CUETools.CTDB</RootNamespace>

CUETools.CTDB/CUETools.CTDB.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.CTDB</AssemblyName>
     <RootNamespace>CUETools.CTDB</RootNamespace>

CUETools.Codecs/CUETools.Codecs.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.Codecs</AssemblyName>
     <RootNamespace>CUETools.Codecs</RootNamespace>

CUETools.Parity/CUETools.Parity.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFrameworks>net47;net20;netstandard2.0</TargetFrameworks>
+    <TargetFrameworks>net20;net47;netstandard2.0</TargetFrameworks>
     <Version>2.1.7.0</Version>
     <AssemblyName>CUETools.Parity</AssemblyName>
     <RootNamespace>CUETools.Parity</RootNamespace>