Add MSIX packaging to projects and reformat XML

Updated `openHAB.Common.csproj` and `openHAB.Core.Client.csproj` to include the `<WindowsPackageType>MSIX</WindowsPackageType>` property, enabling MSIX packaging format for Windows applications. Reformatted XML in `openHAB.Common.csproj` to use tabs instead of spaces for indentation.

Signed-off-by: Christoph Hofmann <[email protected]>

src/openHAB.Common/openHAB.Common.csproj

@@ -1,14 +1,15 @@
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <TargetFramework>net8.0-windows10.0.22621.0</TargetFramework>
-    <RootNamespace>openHAB.Common</RootNamespace>
-    <RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
-    <UseWinUI>true</UseWinUI>
-    <SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
-  </PropertyGroup>
+	<PropertyGroup>
+		<TargetFramework>net8.0-windows10.0.22621.0</TargetFramework>
+		<RootNamespace>openHAB.Common</RootNamespace>
+		<RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+		<UseWinUI>true</UseWinUI>
+		<SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
+		<WindowsPackageType>MSIX</WindowsPackageType>
+	</PropertyGroup>
 
-  <ItemGroup>
-      <PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.241114003" />
-      <PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.26100.1742" />
-  </ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="Microsoft.WindowsAppSDK" Version="1.6.241114003" />
+		<PackageReference Include="Microsoft.Windows.SDK.BuildTools" Version="10.0.26100.1742" />
+	</ItemGroup>
 </Project>

src/openHAB.Core.Client/openHAB.Core.Client.csproj

@@ -11,6 +11,7 @@
 		<PublishProfile>win-$(Platform).pubxml</PublishProfile>
 		<SupportedOSPlatformVersion>10.0.19041.0</SupportedOSPlatformVersion>
 		<RootNamespace>$(MSBuildProjectName.Replace(" ", "_"))</RootNamespace>
+		<WindowsPackageType>MSIX</WindowsPackageType>
 	</PropertyGroup>
 	<ItemGroup>
 	  <Content Include="Schema\openhab-schema.json" />