New wsscp application:
- WebSocket SCP wrapper similar to wsssh but for SCP instead of SSH
- Uses -P option for port detection (SCP standard) instead of -p
- Automatically constructs ProxyCommand for WebSocket tunnels
- Supports same command line syntax as regular SCP
- Includes automatic port detection from -P option
- Full integration with wsssht WebSocket tunnel infrastructure

Implementation details:
- wsscp.h: Header file with configuration structures and function declarations
- wsscp.c: Complete implementation with argument parsing and SCP command generation
- Updated configure.sh to build wsscp alongside other tools
- Added wsscp.1 man page with comprehensive documentation
- Tested functionality with debug mode and argument parsing

Features:
- Automatic wsssht path detection (PATH or same directory)
- Smart port detection: explicit --wssshd-port takes precedence over -P option
- Support for all wsssht tunnel options (--tunnel, --tunnel-control, --debug)
- Compatible with existing wssshc/wsssht infrastructure
- Proper error handling and user-friendly help messages

Usage examples:
  wsscp localfile user@myclient:/remote/path
  wsscp -P 2222 localfile user@myclient.server.com:/remote/path
  wsscp --debug --tunnel websocket localfile user@myclient:/remote/path