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

- Zentralisierte Nuget-Symbole.
 - Entfernte Projekte gelöscht.

DigitalData.Core.Infrastructure/DigitalData.Core.Infrastructure.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>
     <GeneratePackageOnBuild>True</GeneratePackageOnBuild>
@@ -12,14 +12,14 @@
     <Product>DigitalData.Core.Infrastructure</Product>
     <Description>This package provides implementations for data access and other low-level services within the DigitalData.Core.Abstractions library. It includes generic CRUD operations using Entity Framework Core, database context management, and other infrastructure-related functionalities, adhering to Clean Architecture principles to ensure separation of concerns and maintainability.</Description>
     <Copyright>Copyright 2024</Copyright>
-    <PackageIcon>icon.png</PackageIcon>
+    <PackageIcon>core_icon.png</PackageIcon>
     <RepositoryUrl>http://git.dd:3000/AppStd/WebCoreModules.git</RepositoryUrl>
     <RepositoryType>digital data core abstractions clean architecture</RepositoryType>
     <PackageTags>digital data core infrastructure clean architecture</PackageTags>
   </PropertyGroup>
 
   <ItemGroup>
-    <None Include="..\DigitalData.Core.Abstractions\Assets\icon.png">
+    <None Include="..\..\nuget-package-icons\core_icon.png">
       <Pack>True</Pack>
       <PackagePath>\</PackagePath>
     </None>