Show listener port and allow to set an arbitrary one

[davidebeatrici]

Context: #167

[developersu]

You're already allowed

[davidebeatrici]

Oh, sorry... we may want to write that somewhere in the main window.

Perhaps as a tooltip over the currently bound IP address and port(s).

[developersu]

I dunno. It appears:

Most people don't care and it's fine. It's kinda debug information

[davidebeatrici]

I actually meant in the tab where you select the files to expose, where the net functionality is used basically.

[developersu]

Meeeh

[davidebeatrici]

I mean, nothing critical especially now that it's confirmed the info is already shown somewhere, but it would be a nice addition.