Remove VirtualSerial2 directory and all references

[Copilot]

This PR removes the entire VirtualSerial2 directory and all its contents from the repository. VirtualSerial2 was a Windows C++ virtual serial port driver project that existed as a completely separate component from the main SharpCAT C# library.

What was removed

• VirtualSerial2/ directory containing:
  • C++ project files (VirtualSerial2um.vcxproj, fakemodem2um.vcxproj)
  • Visual Studio solution file (VirtualSerial.sln)
  • Windows driver source code (.c, .h files)
  • Resource files (.rc, .inx files)
  • Project documentation

Impact

• No functional impact on the main SharpCAT library
• Repository size reduced by removing unused component
• Simplified repository structure focusing on core C# functionality
• Build process remains unchanged - all existing VS Code tasks and dotnet commands work identically

Verification

• ✅ Main SharpCAT project builds successfully with same warnings as before
• ✅ All development tasks (build, clean, restore, publish) function correctly
• ✅ No references to VirtualSerial2 remain anywhere in the repository
• ✅ No broken dependencies or missing file references

The VirtualSerial2 component had no integration with the main SharpCAT project and could be safely removed without affecting any existing functionality.

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