Move PowerShell.wixext into ext

src/.editorconfig renamed

src/ext/PowerShell/CSharp.Build.props renamed

src/ext/PowerShell/Directory.Build.props renamed

src/ext/PowerShell/Directory.Build.targets renamed

src/ext/PowerShell/FindLocalWix.props renamed

src/ext/PowerShell/PowerShell.wixext.sln renamed

src/ext/PowerShell/README.md renamed

src/ext/PowerShell/appveyor.cmd renamed

src/ext/PowerShell/appveyor.yml renamed

src/ext/PowerShell/nuget.config renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/PowerShellExtensionFixture.cs renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/TestData/TypesFile/Package.en-us.wxl renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/TestData/TypesFile/Package.wxs renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/TestData/TypesFile/PackageComponents.wxs renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/TestData/TypesFile/example.txt renamed

src/ext/PowerShell/test/WixToolsetTest.PowerShell/WixToolsetTest.Powershell.csproj renamed

src/ext/PowerShell/wix.snk renamed

src/ext/PowerShell/wixext/PSCompiler.cs renamed

src/ext/PowerShell/wixext/PSErrors.cs renamed

src/ext/PowerShell/wixext/PSExtensionData.cs renamed

src/ext/PowerShell/wixext/PSWarnings.cs renamed

src/ext/PowerShell/wixext/PowerShellExtensionFactory.cs renamed

src/ext/PowerShell/wixext/WixToolset.PowerShell.wixext.csproj renamed

src/ext/PowerShell/wixext/WixToolset.PowerShell.wixext.targets renamed

src/ext/PowerShell/wixlib/PSExtension.wxs renamed

src/ext/PowerShell/wixlib/powershell.wixproj renamed

src/ext/global.json renamed

src/version.json renamed