Contributing loading feature
fix file loading shortcut, change preferences shortcut as well (match Wireshark's)
no need for an abstract class
disable loading during scanning, so no need for showing any messages
simplify code, remove sout
make fields non-static again and use unserialize() method to populate the feeder
simplify loading code and make it more reliable at the same time
display nice error message if file load fails
move txt file importing code to TXTExporter
update copyright
try to continue scanning only if the loaded file seems incomplete
prefill ip range on start with the current network's range (taking netmask into account)