- Virtualization core: support Shanghai/Zhaoxin CPUs
- User interface: handle command line arguments to VirtualBox correctly
- User interface: improvements to machine manager window, virtual optical disk creator, storage selector window and log viewer window
- User interface: various small fixes and improvements
- Audio: implemented time scheduling for the AC'97 device emulation to keep audio and video in sync
- Graphics: basic support for VMSVGA graphics device in virtual machines using EFI
- Network: fix occasional NATNet crashes
- Network: worked around problems in certain PCnet drivers on old operating systems
- Serial: fixed connecting to pseudo terminals on POSIX hosts
- Linux hosts and guests: fix for building kernel modules against Linux 5.0
Signed-off-by: Pierre-Yves <pyu@riseup.net>