ZWidget: Add Wayland support and ZWIDGET_DISPLAY_BACKEND environment variable #113
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This should be good enough to get a Wayland backend running with ZWidget, which will allow us to remove the SDL2 backend from it eventually.
Note that this utilizes the waylandpp library, which provides C++ bindings for various wayland protocols.
Known bugs:
Due to the second point, keyboard events, popup windows and clipboard stuff aren't tested.
There is also a new ZWIDGET_DISPLAY_BACKEND environment variable added with this PR, that allows one to override the default backend order on Linux (Wayland -> X11 -> SDL2). It is used as follows:
ZWIDGET_DISPLAY_BACKEND=(Wayland/X11/SDL2) ./ZWidgetApp