* UPnP port redirection is supported.
* compile fixes
* compile fix
* optimize reconnection code
* prepared upnp threadification to counter main loop stall at supernode change
* NAT-PMP port forwarding support, temporarily merge codes to resolve conflicts.
* make compile fix
* prepared threadification in more detail
* adopted threadification to new file setup
* cleaned up
* renamed functions and data structures
* fixes
* differentiated between miniupnp and natpmp and added corresponding lib support to makefile
* name
* commented unused header includes
* comments
* license
* fixes
* fixes
* fixes
* NAT-PMP is already available.
* added CLI parameter to disable port forwarding if required
* preliminary made use of multithreading
* adjusted log level
* added man page documentation
* def'ed conf
* made pmpnat adjustments
Co-authored-by: fengdaolong <fengdaolong@gmail.com>
