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>

srcpkgs/das-settings/template

@@ -4,7 +4,7 @@
 # Defaults go to /etc/xdg/das, which /etc/profile.d/das-xdg.sh puts in front of
 # /etc/xdg: stock Xfce files stay untouched and users' own changes still win.
 pkgname=das-settings
-version=0.3.0
+version=0.4.0
 revision=1
 create_wrksrc=yes
 depends="das-theme lightdm lightdm-gtk-greeter xfce4-notifyd xfce4-panel