Version 6.1-d1b69bb for VirtualBox 6.1 package

Based on phpvirtualbox with commit d1b69bb, check commit log for list of all the changes.
Notable changes are:

• Fix adding USB device filter from device
• Add VirtIO SCSI support

Version 6.1 for VirtualBox 6.1 package

This package contains phpVirtualBox version 6.1 packaged in spk file for easy installation in Synology DSM.

Version 6.0 for VirtualBox 6.0 package

This package contains phpVirtualBox version 6.0 packaged in spk file for easy installation in Synology DSM.

Version 5.2 for VirtualBox 5.2

This package contains phpVirtualBox version 5.2 packaged in spk file for easy installation in Synology DSM.