Unbreak Debian 11 and partially Ubuntu 22.04 (Wayland+GDM+Gnome) (#81)

* Unbreaking Debian 11 and partially Ubuntu 22.04

* pre-cleanup

* pre-cleanup2

* Update im-launch

* Update gnome-extension-ding

* polishing

* not yet

* Update ubuntu.flags

Allow GDM to boot. `No new privs` fix.

* Update debian.flags

Allow GDM to boot. `No new privs` fix.

* Update CONTRIBUTING.md

* fixes

* reverting w

* move setpriv to main.flags

apparmor.d/groups/freedesktop/xhost

@@ -11,11 +11,15 @@ profile xhost @{exec_path} {
   include <abstractions/base>
   include <abstractions/nameservice-strict>
 
+  unix (send, receive, connect) type=stream peer=(addr=@/tmp/.X11-unix/*, label=xorg),
+
   @{exec_path} mr,
 
   owner @{HOME}/.Xauthority r,
   owner @{run}/user/@{uid}/gdm/Xauthority r,
 
+  /tmp/.X11-unix/* rw,
+
   # file_inherit
   /dev/tty[0-9]* rw,
   owner @{HOME}/.xsession-errors w,