[Rd] proposal: 'dev.capabilities()' can also query Unicode capabilities of current graphics device

[Trevor Davis]

Hi,

It would be nice if `grDevices::dev.capabilities()` could also be used to
query whether the current graphics device supports Unicode.  In such a case
I'd expect it to return `FALSE` if `pdf()` is the current graphics device
and something else for the Cairo or Quartz devices.

Thanks,

Trevor

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