add CWD in server status output

Forwarding mvoidex#1 to the upstream.

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README mentions that filenames are resolved relative to the server's CWD (current working directory) — rather than to the client's.

While it's technically possible to intrusively determine working path of a foreign process (with tools like `readlink /proc/$PID/cwd`, or `procexp.exe` on Windows) — these methods are rarely userfriendly and mostly inconvenient for regular use (though excellent for troubleshooting/debug).

This addition can be very useful to simplify hdevtools setup and plugin integration, especially on Windows.