Changes

• Fix core error not showing when the statusbar was hidden
• Fix .ndd/.64d not being in the empty ROM Browser widget
• Fix .jpg/.jpeg files not working on covers on Windows
• Fix updater script not copying subdirectories on Windows (for portable installs)
• Fix 64DD Disks which required the development IPL not working
• Fix 64DD Disks showing the wrong internal ROM name (this fix requires clearing the ROM cache)
• Fix cover filenames allowing invalid characters (they will now be replaced by _)
• Add more icons to View menu in the menu bar
• Add 'Uniform Size (Grid View)' to View menu in the menu bar
• Add smooth scrolling to List View and Grid View