Format XML configuration files on build with tidy

FormatConfigFiles.proj

<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="All" InitialTargets="_SetVersion" xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0">
    <Import Project="$(MSBuildProjectDirectory)\toolset\msbuildcommunitytasks\MSBuild.Community.Tasks.Targets"/>
    <Target Name="_Tidy">
        <ItemGroup>
            <ConfigFiles
                Include="$(MSBuildProjectDirectory)\**\*.config"
                Exclude="$(MSBuildProjectDirectory)\packages\**\*.*;
                        $(MSBuildProjectDirectory)\**\packages.config;
                        $(MSBuildProjectDirectory)\**\NuGet.config;
                        $(MSBuildProjectDirectory)\**\repositories.config;
                        $(MSBuildProjectDirectory)\.vs\**\*.*" />
        </ItemGroup>
        <Message Text="Cleaning up configuration file formatting." />
        <!--
            * HTML Tidy cleans up the config file XML and places it in a temp location (filename.formatted)
            * A post-formatting task cleans up key/value pair nodes to be flat and easier to read.
            * The formatted config file is copied over the top of the original XML file and the temp file is deleted.
        -->
        <Exec Command="tidy.exe --input-xml yes --output-xml yes --preserve-entities yes --indent yes --indent-spaces 4 --input-encoding utf8 --indent-attributes yes --wrap 0 &quot;%(ConfigFiles.FullPath)&quot; > &quot;%(ConfigFiles.FullPath).formatted&quot;" WorkingDirectory="$(MSBuildProjectDirectory)\toolset\tidy" Condition="'%(ConfigFiles.FullPath)'!=''" />
        <FileUpdate Files="%(ConfigFiles.FullPath).formatted" Regex="&lt;add\s+(key|name)=&quot;([^&quot;]*)&quot;\s+value=&quot;([^&quot;]*)&quot;\s+/&gt;" ReplacementText="&lt;add $1=&quot;$2&quot; value=&quot;$3&quot; /&gt;" Condition="'%(ConfigFiles.FullPath)'!=''" />
        <Copy DestinationFiles="%(ConfigFiles.FullPath)" SourceFiles="%(ConfigFiles.FullPath).formatted" Condition="'%(ConfigFiles.FullPath)'!=''" />
        <Delete Files="%(ConfigFiles.FullPath).formatted" Condition="'%(ConfigFiles.FullPath)'!=''" />
    </Target>
</Project>