Generic_send supports propagation to Windows

Created by: balcirakpeter

Two destination types were added to generic_send: user@host-windows and host-windows-proxy. user@host-windows will be used as a direct connection to windows server 2019 through ssh. Tar file, which will be sent, is encoded to base64 in generic_send. host-windows-proxy will be used as a connection to windows proxy server (solution for older servers). Tar file, which will be sent, is also encoded to base64 in generic_send, but in its end is added destination server. Name of the proxy server has to be defined in the file /etc/perun/services/generic_send/generic_send.conf in the variable WINDOWS_PROXY.