Bugfixes and minor changes:
MSW: Binaries are now also signed using a SHA256 signature and certificate.
OS X: Move location of COPYING file containing the GPL to a different location in the bundle. On some systems OS X cannot verify the bundle with the file at the old location
Restore focused item if changing directory listing sort order
Fix restoring the column widths of the failed transfers tab in the queue when starting FileZilla
MSW: Double-clicking a divider between a list header in the queue now adjust the sizes in the other tabs just as dragging the width would
