Chore: Hinzufügen des .net 8-Frameworks zu allen .net-Projekten.

- Zentralisierte Nuget-Symbole.
 - Entfernte Projekte gelöscht.

DigitalData.Core.Client/DigitalData.Core.Client.csproj

@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net7.0</TargetFramework>
+    <TargetFrameworks>net7.0;net8.0</TargetFrameworks>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <Description>This package provides HTTP client extension methods for the DigitalData.Core library, offering simplified and asynchronous methods for fetching and handling HTTP responses. It includes utility methods for sending GET requests, reading response content as text or JSON, and deserializing JSON into dynamic or strongly-typed objects using Newtonsoft.Json. These extensions facilitate efficient and easy-to-read HTTP interactions in client applications.</Description>
@@ -12,11 +12,18 @@
     <Product>Digital Data GmbH</Product>
     <Copyright>Copyright 2024</Copyright>
     <PackageProjectUrl></PackageProjectUrl>
-    <PackageIcon>Assets\icon.png</PackageIcon>
+    <PackageIcon>core_icon.png</PackageIcon>
     <RepositoryUrl>http://git.dd:3000/AppStd/WebCoreModules.git</RepositoryUrl>
     <PackageTags>digital data core http client json serilization</PackageTags>
   </PropertyGroup>
 
+  <ItemGroup>
+    <None Include="..\..\nuget-package-icons\core_icon.png">
+      <Pack>True</Pack>
+      <PackagePath>\</PackagePath>
+    </None>
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="7.0.0" />
     <PackageReference Include="Microsoft.Extensions.Options" Version="7.0.0" />