Bug fix - crash when running Appearance Settings on headless systems

Improvements

• labwc compositor now used as the default on all models of Raspberry Pi
• wf-panel-pi now loads plugins dynamically at runtime
• New raindrop screen configuration tool to replace arandr
• squeekboard on-screen keyboard installed; will automatically run on systems
  with touchscreens, and can be manually enabled in rc-gui for others
• Improved support for touchscreens - long press for right-click, and
  double-tap for double-click
• Update installer moved out of panel code into separate gui-updater package
• Missing cursors added to icon theme
• Wizard no longer auto-pairs Bluetooth HID devices by default - create the
  file "/boot/firmware/btautopair" to enable, or reboot wizard after first run
• Modified handling of Pi 5 power button to reduce CPU load when in shutdown
  dialog
• Raspberry Pi Connect now controlled by dedicated panel plugin instead of system tray icon and option in rc-gui
• Screen sharing in Raspberry Pi Connect now available as soon as a running
  WayVNC server is detected
• Safety info URL added to main menu
• Chromium package renamed from chromium-browser to chromium
• Various memory leaks in pcmanfm fixed
• Bug fix - crash when running Appearance Settings on headless systems
• Bug fix - crash when opening icon chooser in application properties dialog
• Translations updated
• Chromium updated to 130.0.6723.58
• Firefox updated to 131.0.3
• Raspberry Pi firmware a2e586ba98ce68f7d11b1c717ad8329b95dcb3b6
• Linux kernel 6.6.51 - 5aeecea9f4a45248bcf564dec924965e066a7bfd