Rename the [Ee]xts dir to ext (#38852)

**WARNING:** This PR will probably blow up all in-flight PRs

at some point in the early days of CmdPal, two of us created seperate
`Exts` and `exts` dirs. Depending on what the casing was on the branch
that you checked one of those out from, it'd get stuck like that on your
PC forever.

Windows didn't care, so we never noticed.

But GitHub does care, and now browsing the source on GitHub is basically
impossible.

Closes #38081

src/modules/cmdpal/ext/Microsoft.CmdPal.Ext.WinGet/Microsoft.CmdPal.Ext.WinGet.csproj

@@ -0,0 +1,111 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <Import Project="..\..\..\..\Common.Dotnet.CsWinRT.props" />
+  <PropertyGroup>
+    <RootNamespace>Microsoft.CmdPal.Ext.WinGet</RootNamespace>
+    <ApplicationManifest>app.manifest</ApplicationManifest>
+    <PublishProfile>win-$(Platform).pubxml</PublishProfile>
+    <UseWinUI>false</UseWinUI>
+    <Nullable>enable</Nullable>
+    <EnableMsixTooling>true</EnableMsixTooling>
+    <OutputPath>$(SolutionDir)$(Platform)\$(Configuration)\WinUI3Apps\CmdPal</OutputPath>
+    <AppendTargetFrameworkToOutputPath>false</AppendTargetFrameworkToOutputPath>
+    <AppendRuntimeIdentifierToOutputPath>false</AppendRuntimeIdentifierToOutputPath>
+  </PropertyGroup>
+
+  <PropertyGroup>
+      <CsWinRTIncludes>Microsoft.Management.Deployment</CsWinRTIncludes>
+      <CsWinRTGeneratedFilesDir>$(OutDir)</CsWinRTGeneratedFilesDir>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <None Remove="Assets\Extension.png" />
+    <None Remove="Assets\Extension.svg" />
+    <None Remove="Assets\Store.dark.png" />
+    <None Remove="Assets\Store.dark.svg" />
+    <None Remove="Assets\Store.light.png" />
+    <None Remove="Assets\Store.light.svg" />
+    <None Remove="Assets\WinGet.png" />
+    <None Remove="Assets\WinGet.svg" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <Manifest Include="$(ApplicationManifest)" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\..\..\common\ManagedCommon\ManagedCommon.csproj" />
+    <ProjectReference Include="..\..\extensionsdk\Microsoft.CommandPalette.Extensions.Toolkit\Microsoft.CommandPalette.Extensions.Toolkit.csproj" />
+    <ProjectReference Include="..\..\Microsoft.CmdPal.Common\Microsoft.CmdPal.Common.csproj" />
+  </ItemGroup>
+
+  <!--
+    Defining the "Msix" ProjectCapability here allows the Single-project MSIX Packaging
+    Tools extension to be activated for this project even if the Windows App SDK Nuget
+    package has not yet been restored.
+  -->
+  <ItemGroup Condition="'$(DisableMsixProjectCapabilityAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <ProjectCapability Include="Msix" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <CsWinRTInputs Include="$(PkgMicrosoft_WindowsPackageManager_ComInterop)\lib\uap10.0\Microsoft.Management.Deployment.winmd" />
+
+    <!-- Before v1.10 of this package, it wasn't in the uap10.0 dir  -->
+    <Content Include="$(PkgMicrosoft_WindowsPackageManager_ComInterop)\lib\uap10.0\Microsoft.Management.Deployment.winmd" Link="Microsoft.Management.Deployment.winmd" CopyToOutputDirectory="PreserveNewest" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Windows.CsWin32">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Microsoft.WindowsPackageManager.ComInterop">
+      <NoWarn>NU1701</NoWarn>
+      <GeneratePathProperty>true</GeneratePathProperty>
+      <IncludeAssets>none</IncludeAssets>
+    </PackageReference>
+  </ItemGroup>
+
+  <!--
+    Defining the "HasPackageAndPublishMenuAddedByProject" property here allows the Solution
+    Explorer "Package and Publish" context menu entry to be enabled for this project even if
+    the Windows App SDK Nuget package has not yet been restored.
+  -->
+  <PropertyGroup Condition="'$(DisableHasPackageAndPublishMenuAddedByProject)'!='true' and '$(EnableMsixTooling)'=='true'">
+    <HasPackageAndPublishMenu>true</HasPackageAndPublishMenu>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Compile Update="Properties\Resources.Designer.cs">
+      <DependentUpon>Resources.resx</DependentUpon>
+      <DesignTime>True</DesignTime>
+      <AutoGen>True</AutoGen>
+    </Compile>
+  </ItemGroup>
+
+  <ItemGroup>
+    <Content Update="Assets\Extension.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Update="Assets\Extension.svg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Update="Assets\Store.dark.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Update="Assets\Store.dark.svg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Update="Assets\Store.light.png">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+    <Content Update="Assets\Store.light.svg">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </Content>
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Update="Properties\Resources.resx">
+      <LastGenOutput>Resources.Designer.cs</LastGenOutput>
+      <Generator>PublicResXFileCodeGenerator</Generator>
+    </EmbeddedResource>
+  </ItemGroup>
+</Project>