Is it possible to create terminal buffers someplace besides the upper left corner?
Hi, thanks for this project.  I'm excited to use it.

Please take a look at this asciicast:  https://asciinema.org/a/352660

Notice how the action happens below the prompt.   I'd like to do something similar with illwill in non-fullscreen mode.  But I see that `newTerminalBuffer` always creates buffers in the top left corner of my terminal--I only have control over their width and height.

Can it be done with illwill?  What would the strategy be?