Fix error when loading torrent through IPC

Fix bug from commit 0045ec0cf1e48: missing args attribute error when
loading torrent through IPC on non-windows.
Fix #2240 : Win32 freespace issue with large capacity drives
Fix Gtk addtorrentdialog parent None error for single file torrents
Fix mapped_files error in AddTorrentDialog
Merge branch '1.3-stable' into OSX-Pkg-1.3-stable
Fix unable to display non-ascii chars in gtkui
Move osx.py code into gtkui.py and most working
Add quartz check and fix open file
new menubar_osx