Use cell positioning to look up resupply actors. Fixes #3901.

FindActorsInBox only checks against the centre of
actors, so testing two points is rarely going to
work.
Merge pull request #3902 from pchote/helicopter-fix

Fix helicopter reloading
reorder checkboxes more intuitively

port forwarding under ports
complete password protected servers

closes #2290
separate connection and direct connect dialog from serverbrowser
Don't crash if the server mods don't match.

This allows the ingame dialog to be displayed.