Wayland support?

Hi there!

First of all, thank you for developing RX. I've been using it for a while now and like it very much.

I am using Sway which uses Wayland instead of X11. I know there is xorg-server-xwayland package available but would like to ask whether Wayland will be natively supported or not?
When I try to run RX, it gives me this error:
```
thread 'main' panicked at 'GLFW Error: X11: Failed to open display :0', /home/makkusu/.cargo/registry/src/github.com-1ecc6299db9ec823/glfw-0.34.0/src/lib.rs:422:5
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
```

I suppose the program complains about X11 missing from the system.
Unfortunately, I am not an experienced developer at all, therefore I cannot implement support for Wayland by myself and create a pull request right now.

Kind regards,
Makkusu