Support mac-specific inputs

[AvramRobert]

What strokes do macs emit when the command key is pressed?
How can we deal with and leverage them?

[AvramRobert]

Update: This key is apparenty not captured by laterna.
AWT caputres it in the background but laterna (the last version we got to look at) doesn't seem to map/propagate it.
We could try figure out which key it is and open an issue at laterna stating it would be nice to have it.

For now, we'll just leave this open until something is done.