feat: Add wsssht - WebSocket SSH Tunnel tool

- Create wsssht.c: Stripped-down tunnel setup tool (like wsssh --dev-tunnel)
- Add separate wssht.conf configuration file support
- Implement read_config_value_from_file() for custom config files
- Create wssht.conf.example with tunnel configuration options
- Update wsssht.1 man page with separate config file documentation
- Add wsssht to build system (configure.sh, Makefile)
- Test successful compilation and functionality

wsssht provides manual tunnel setup without auto-executing SSH/SCP,
displaying connection information for telnet, nc, or any TCP client.