Add x64dbg debugger backend integration for Binary Ninja

[xusheng6]

Add x64dbg debugger backend integration

Summary

Ghidra recently added x64dbg support using x64dbg-automate. This would enable seamless synchronization
between Binary Ninja's static analysis and x64dbg's dynamic debugging.

Proposed Approach

Use the existing x64dbg-automate plugin rather than implementing a custom GDB RSP stub.

Why:

• ✅ Plugin already exists and is maintained
• ✅ Full access to x64dbg features (expressions, commands, metadata)
• ✅ Rich event notifications (breakpoints, threads, DLLs, exceptions)
• ✅ Quick to implement - can reference Ghidra's implementation
• ✅ Better than GDB RSP which would require more work for fewer features

Architecture:
Binary Ninja Plugin
↓ (Python client)
x64dbg-automate Plugin (ZeroMQ + MessagePack)
↓
x64dbg.exe

Implementation

1. Install x64dbg-automate plugin in x64dbg
2. Use Python client: pip install x64dbg_automate protobuf
3. Create Binary Ninja plugin that:
   • Launches/attaches to processes
   • Synchronizes breakpoints, registers, memory
   • Handles events from x64dbg

Reference Implementation

Ghidra's x64dbg integration:

• Location: Ghidra/Debug/Debugger-agent-x64dbg/src/main/py/src/ghidraxdbg/
• Ghidra Repository

Key Links

• x64dbg-automate Plugin: https://github.com/dariushoule/x64dbg-automate
• Python Client: https://github.com/dariushoule/x64dbg-automate-pyclient
• Documentation: https://dariushoule.github.io/x64dbg-automate-pyclient/
• Binary Ninja Debugger API: https://docs.binary.ninja/guide/debugger.html

Success Criteria

• Launch/attach to processes from Binary Ninja
• Bidirectional breakpoint synchronization
• Register/memory view synchronization
• Step/continue/pause controls
• Event handling (breakpoints, exceptions, thread/DLL events)