System Image V4, Introduce reform2-a311d

• introduces reform2-a311d as a new platform (for RCM4+BPI processor module)
• unifies rescue and "full" image into one, more minimal image
• we now ship only 2 minimalistic but comfortably customized desktop environments, sway and wayfire (with our own fork of firedecor for window decorations)
  • wofi (wayland native) instead of rofi as a launcher
  • reform-tray as a tray icon menu for finding help and essential system controls
  • wallpaper "reform-mountains" by Philipp Broemme (CC-BY-SA)
  • reform-synaptic as a wrapper to run synaptic package management GUI on wayland
  • autostart of lxpolkit, blueman-applet, nm-applet, pasystray
  • dunst as notification daemon
• foot now default (fast) terminal
• firefox now default browser
• no longer part of the default image, but can be installed by the user: gnome, KDE, chromium, libreoffice, gimp, inkscape, kicad, freecad, dosbox, etc.