Without Vagrant

• Install VM directly to VirtualBox without Vagrant
• Retrieve images within a zip file prepared for Balena Etcher
• Get Abitti version string and image zip from a static URL
• Get Matriculation exam image zip from an URL dependent of an install passphrase
• gettext-style localisation
• Suppress some repeating log messages
• Turn automatic updates back on from UI if disabled
• Improve error message when detected Windows Hypervisor
• Improve log messages on VBoxManage errors