Initial support for Wayland and Mir

Giovanni Panozzo requested to merge wayland into next

Allow remmina to be run under native wayland. Tested under Arch Gnome on Wayland, with

GDK_BACKEND=wayland remmina
  • Plugins which use GtkSocket will report a correct error and will never be able to run
  • Remmina still need to be linked to Xorg libraries for some extra functions (ie: keyboard mapping in RDP)

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