put native code into cocoa package
Improve subtitle display when resize window
Add open error alert sheet
Remove some useless views, inline callbacks
Add Xcode project for cocoa GUI
Handle Xcode compile warning
ignore xccheckout
Rearrange cocoa gui code
Rename gui interfaces
Add menu bar
Add recent opened file menu
Add play/pause menu
Add subtitle menu
Add audio menu
Add other menus
Fix bug: wrong left time
ignore xcuserstate
Change shortcuts
Fix init audio volume
Fix search subtitle menu