Optional sounds on transfer complete, disconnect, etc.

[frostman]

It would be nice to have the option (off by default of
course) to have FileZilla play sounds when various things
happen or fail to happen.

The sounds should be user-choosable with some
unobtrusive defaults (or maybe even defaults based on
language preference!).

This is really nice when you are transfering a lot (or
slowly) and have to wait to do X until the transfer is
complete.

That's the only thing I miss from other programs. Great
work people!

[codesquid]

Already requested in another request