This PR implements comprehensive hardware breakpoint and watchpoint support across all debug adapters (LLDB, GDB RSP, Esreven, DbgEng), addressing a long-standing feature request with full UI integration.

Key Features

Standardized API

• Added DebugBreakpointType enum with support for:
  • Software breakpoints (default, unchanged behavior)
  • Hardware execution breakpoints
  • Hardware read watchpoints
  • Hardware write watchpoints
  • Hardware access (read/write) watchpoints
• New methods: AddHardwareBreakpoint() and RemoveHardwareBreakpoint() with size parameter support

Cross-Adapter Implementation

• LLDB Adapter: Uses native LLDB hardware breakpoint and watchpoint APIs
• GDB/Esreven Adapters: Uses GDB RSP protocol commands (Z1-Z4/z1-z4 for different breakpoint types)
• DbgEng Adapter: Uses WinDbg's ba commands (ba e/r/w/a for execute/read/write/access)
• Consistent interface across all adapters with proper error handling

Complete UI Integration

• Hardware Breakpoint Dialog: New HardwareBreakpointDialog with address input, type selection (Execute, Read, Write, Access), size configuration for watchpoints, and contextual help
• Enhanced Breakpoint List: Added "Type" column showing breakpoint types with color-coded display for better visual distinction
• Improved Add Breakpoint Menu: Context menu now offers "Software Breakpoint" and "Hardware Breakpoint..." options

Python API Integration

from debugger import DebuggerController, DebugBreakpointType

# Hardware execution breakpoint
controller.add_hardware_breakpoint(0x401000, DebugBreakpointType.HardwareExecuteBreakpoint)

# Hardware write watchpoint (4 bytes)
controller.add_hardware_breakpoint(0x402000, DebugBreakpointType.HardwareWriteBreakpoint, 4)

# Hardware read watchpoint (8 bytes)
controller.add_hardware_breakpoint(0x403000, DebugBreakpointType.HardwareReadBreakpoint, 8)

Backend Command Support

For advanced users, direct backend commands remain available:

# LLDB
controller.send_command("breakpoint set --address 0x401000 -H")
controller.send_command("watchpoint set expression -w write -s 4 -- 0x402000")

# GDB RSP
controller.send_command("Z1,401000,1")  # Hardware execution breakpoint
controller.send_command("Z2,402000,4")  # Hardware write watchpoint

# DbgEng
controller.send_command("ba e1 0x401000")  # Hardware execution breakpoint
controller.send_command("ba w4 0x402000")  # Hardware write watchpoint

Implementation Details

• Backward Compatibility: Existing software breakpoint functionality unchanged
• Size Support: Watchpoints support 1, 2, 4, and 8 byte sizes as supported by target hardware
• Enhanced AddBreakpoint: Existing AddBreakpoint() methods now handle hardware breakpoint types
• FFI Layer: Full C API support for external integrations
• UI Enhancement: Breakpoint list now displays type information with visual distinction
• Documentation: Updated user guide with comprehensive examples and usage patterns

Files Changed

• Core: debuggercommon.h, debugadapter.h/.cpp, ffi.cpp
• API: debuggerapi.h, debuggercontroller.cpp, ffi.h
• Adapters: lldbadapter.h/.cpp, gdbadapter.h/.cpp, esrevenadapter.h/.cpp, dbgengadapter.h/.cpp
• UI: breakpointswidget.h/.cpp, hardwarebreakpointdialog.h/.cpp
• Documentation: Updated guide with API examples and usage patterns
• Examples: Added comprehensive example script demonstrating all functionality

The implementation provides a complete hardware breakpoint solution with intuitive UI integration while maintaining architectural consistency and ensuring all existing functionality continues to work unchanged.

Fixes #53.

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