Major refactoring: Extract shared libraries and fix port option behavior

- Extracted ~1500+ lines of duplicate code into shared libraries:
  * wssshlib.h/.c - Shared utilities (config, flags, ports, IDs)
  * websocket.h/.c - WebSocket functions (handshake, framing, messaging)
  * wssh_ssl.h/.c - SSL/TLS setup functions
  * tunnel.h/.c - Tunnel management (setup, reconnection, data handling)

- Fixed critical port option behavior:
  * -p/-P options now correctly specify wssshd server port
  * Removed misleading documentation about options being passed through
  * Updated help text and man pages to reflect correct behavior

- Cleaned up help documentation:
  * Removed duplicate 'Options:' sections from wsssh and wsscp
  * Consolidated all options into single, clean sections

- Updated build system:
  * Modified configure.sh and Makefile for new library structure
  * Proper linking of wsssh and wsscp against shared libraries

- Updated documentation:
  * CHANGELOG.md - Added version 1.4.6 with comprehensive details
  * README.md - Updated architecture and project structure
  * DOCUMENTATION.md - Reflected new library structure
  * Man pages - Corrected port option examples
  * TODO.md - Updated completion status

- Maintained backward compatibility while improving maintainability