Fix issues found testing stage 5 in a VM

- Calamares branding takes the version from VERSION at ISO build time
- das-update tray hides its icon when updates were installed elsewhere
  (watches the xbps package database)
- Installer removes guest tools of other hypervisors; the live image
  starts VBoxClient only inside VirtualBox
- Live session no longer locks the screen while the installer runs
- das-tools 0.2.0, das-installer 0.2.0, das-settings 0.4.0

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

live/include/etc/xdg/autostart/vboxclient.desktop

@@ -0,0 +1,8 @@
+[Desktop Entry]
+# Replaces the file from virtualbox-ose-guest: start the VirtualBox clients
+# only inside VirtualBox, other hypervisors get a "kernel service is not
+# running" notification at every login.
+Type=Application
+Name=VirtualBox User Session
+Exec=sh -c "grep -qs VirtualBox /sys/class/dmi/id/product_name && exec /usr/bin/VBoxClient-all"
+NoDisplay=true